Fixes the enabled_vlans argument (#3061)

This argument had a couple of issues with it. First, as it was
being interpreted in the code, it did not check for idempotency.

Second, the model of having the parameters be "all_*" is going to
hinder the ability to "undo", so-to-speak, what the user did while
maintaining legibility.

Consider if the user specified "all_enabled_vlans='net1'" and then
decided they wanted to backout of this decision. What is the proper
argument to fulfill this wish? "all_enabled_vlans='...?'

This patch changes the all_enabled_vlans argument to be "enabled_vlans",
ensures that idempotency works, and also provides for a way to "undo" a
change to the enabled VLANs by allowing the user to specify the special
case VLAN named "ALL" (all capitals).

This makes the parameter more intuitive because the users will specify
which vlans they want to make the virtual available on

  * enabled_vlans="net1"

but also allows them to "undo" what they did by setting it back with
the case of all

  * enabled_vlans="ALL"

lib/ansible/modules/extras/network/f5/bigip_virtual_server.py

@@ -86,10 +86,11 @@ options:
       - List of rules to be applied in priority order
     required: false
     default: None
-  all_enabled_vlans:
+  enabled_vlans:
     version_added: "2.2"
     description:
-      - List of vlans to be enabled
+      - List of vlans to be enabled. When a VLAN named C(ALL) is used, all
+        VLANs will be allowed.
     required: false
     default: None
   pool:
@@ -132,7 +133,7 @@ EXAMPLES = '''
       all_profiles:
           - http
           - clientssl
-      all_enabled_vlans:
+      enabled_vlans:
           - /Common/vlan2
   delegate_to: localhost
 
@@ -272,7 +273,7 @@ def set_profiles(api, name, profiles_list):
     try:
         if profiles_list is None:
             return False
-        current_profiles = map(lambda x: x['profile_name'], get_profiles(api, name))
+        current_profiles = list(map(lambda x: x['profile_name'], get_profiles(api, name)))
         to_add_profiles = []
         for x in profiles_list:
             if x not in current_profiles:
@@ -297,25 +298,59 @@ def set_profiles(api, name, profiles_list):
     except bigsuds.OperationFailed as e:
         raise Exception('Error on setting profiles : %s' % e)
 
+
+def get_vlan(api, name):
+    return api.LocalLB.VirtualServer.get_vlan(
+        virtual_servers=[name]
+    )[0]
+
+
 def set_enabled_vlans(api, name, vlans_enabled_list):
     updated = False
+    to_add_vlans = []
     try:
         if vlans_enabled_list is None:
-            return False
-
-        to_add_vlans = []
-        for x in vlans_enabled_list:
-            to_add_vlans.append(x)
+            return updated
+        current_vlans = get_vlan(api, name)
 
+        # Set allowed list back to default ("all")
+        #
+        # This case allows you to undo what you may have previously done.
+        # The default case is "All VLANs and Tunnels". This case will handle
+        # that situation.
+        if 'ALL' in vlans_enabled_list:
+            # The user is coming from a situation where they previously
+            # were specifying a list of allowed VLANs
+            if len(current_vlans['vlans']) > 0 or \
+               current_vlans['state'] is "STATE_ENABLED":
                 api.LocalLB.VirtualServer.set_vlan(
                     virtual_servers=[name],
-            vlans = [{ 'state':'STATE_ENABLED', 'vlans':[to_add_vlans] }]
+                    vlans=[{'state': 'STATE_DISABLED', 'vlans': []}]
                 )
                 updated = True
+        else:
+            if current_vlans['state'] is "STATE_DISABLED":
+                to_add_vlans = vlans_enabled_list
+            else:
+                for vlan in vlans_enabled_list:
+                    if vlan not in current_vlans['vlans']:
+                        updated = True
+                        to_add_vlans = vlans_enabled_list
+                        break
+            if updated:
+                api.LocalLB.VirtualServer.set_vlan(
+                    virtual_servers=[name],
+                    vlans=[{
+                        'state': 'STATE_ENABLED',
+                        'vlans': [to_add_vlans]
+                    }]
+                )
+
         return updated
     except bigsuds.OperationFailed as e:
         raise Exception('Error on setting enabled vlans : %s' % e)
 
+
 def set_snat(api, name, snat):
     updated = False
     try:
@@ -488,7 +523,7 @@ def main():
         port=dict(type='int'),
         all_profiles=dict(type='list'),
         all_rules=dict(type='list'),
-        all_enabled_vlans=dict(type='list'),
+        enabled_vlans=dict(type='list'),
         pool=dict(type='str'),
         description=dict(type='str'),
         snat=dict(type='str'),
@@ -521,7 +556,13 @@ def main():
     port = module.params['port']
     all_profiles = fq_list_names(partition, module.params['all_profiles'])
     all_rules = fq_list_names(partition, module.params['all_rules'])
-    all_enabled_vlans = fq_list_names(partition, module.params['all_enabled_vlans'])
+
+    enabled_vlans = module.params['enabled_vlans']
+    if enabled_vlans is None or 'ALL' in enabled_vlans:
+        all_enabled_vlans = enabled_vlans
+    else:
+        all_enabled_vlans = fq_list_names(partition, enabled_vlans)
+
     pool = fq_name(partition, module.params['pool'])
     description = module.params['description']
     snat = module.params['snat']