Text's .translate() is easier to use than bytes

Text strings and byte strings both have a translate method but the byte
string version is harder to use.  It requires a mapping of all 256 bytes
to a translation value.  Text strings only require a mapping from the
characters that are changing to the new string.  Switching to text
strings on both py2 and py3 allows us to state what we're getting rid of
simply without having to rely on the maketrans() helper function.

lib/ansible/module_utils/facts.py

@@ -37,13 +37,6 @@ from ansible.module_utils.six import PY3, iteritems
 from ansible.module_utils.six.moves import configparser, StringIO
 from ansible.module_utils._text import to_native
 
-try:
-    # python2
-    from string import maketrans
-except ImportError:
-    # python3
-    maketrans = str.maketrans # TODO: is this really identical?
-
 try:
     import selinux
     HAVE_SELINUX=True
@@ -1647,8 +1640,8 @@ class OpenBSDHardware(Hardware):
         # total: 69268k bytes allocated = 0k used, 69268k available
         rc, out, err = self.module.run_command("/sbin/swapctl -sk")
         if rc == 0:
-            swaptrans = maketrans('kmg', '   ')
-            data = out.split()
+            swaptrans = { ord(u'k'): None, ord(u'm'): None, ord(u'g'): None}
+            data = to_text(out, errors='surrogate_or_strict').split()
             self.facts['swapfree_mb'] = int(data[-2].translate(swaptrans)) // 1024
             self.facts['swaptotal_mb'] = int(data[1].translate(swaptrans)) // 1024