Get rid of mktemp dependency to support AIX

The function call has been renamed to better reflect what it does, and we
reduced the number of calls from two to one in case the remote user is not
root.

This patch also fixes a string concatenation in _copy_module() that
should use os.path.join()

This closes #436

lib/ansible/runner/__init__.py

@@ -639,7 +639,7 @@ class Runner(object):
         cache = self.setup_cache.get(host, {})
         module_name = utils.template(self.module_name, cache, self.setup_cache)
 
-        tmp = self._get_tmp_path(conn)
+        tmp = self._make_tmp_path(conn)
         result = None
 
         if self.module_name == 'copy':
@@ -691,22 +691,20 @@ class Runner(object):
 
     # *****************************************************
 
-    def _get_tmp_path(self, conn):
-        ''' gets a temporary path on a remote box '''
+    def _make_tmp_path(self, conn):
+        ''' make and return a temporary path on a remote box '''
 
         basetmp = C.DEFAULT_REMOTE_TMP
         if self.remote_user == 'root':
             basetmp = "/var/tmp"
-        cmd = "mktemp -d %s/ansible.XXXXXX" % basetmp
+        basetmp = os.path.join(basetmp, 'ansible-%s-%s' % (time.time(), random.randint(0, 2**48)))
+
+        cmd = "mkdir -p %s" % basetmp
         if self.remote_user != 'root':
-            cmd = "mkdir -p %s && %s" % (basetmp, cmd)
+            cmd += " && chmod a+x %s" % basetmp
 
         result = self._low_level_exec_command(conn, cmd, None, sudoable=False)
-        cleaned = result.split("\n")[0].strip() + '/'
-        if self.remote_user != 'root':
-            cmd = 'chmod a+x %s' % cleaned
-            self._low_level_exec_command(conn, cmd, None, sudoable=False)
-        return cleaned
+        return basetmp
 
 
     # *****************************************************
@@ -720,7 +718,7 @@ class Runner(object):
         if not os.path.exists(in_path):
             raise errors.AnsibleFileNotFound("module not found: %s" % in_path)
 
-        out_path = tmp + module
+        out_path = os.path.join(tmp, module)
         conn.put_file(in_path, out_path)
         return out_path