ipautil: move is_fips_enabled() to ipaplatform.tasks

The FIPS setting is platform-specific.

https://fedorahosted.org/freeipa/ticket/6474

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipapython/ipautil.py

@@ -1467,25 +1467,6 @@ else:
     fsdecode = os.fsdecode  #pylint: disable=no-member
 
 
-def is_fips_enabled():
-    """
-    Checks whether this host is FIPS-enabled.
-
-    Returns a boolean indicating if the host is FIPS-enabled, i.e. if the
-    file /proc/sys/crypto/fips_enabled contains a non-0 value. Otherwise,
-    or if the file /proc/sys/crypto/fips_enabled does not exist,
-    the function returns False.
-    """
-    try:
-        with open(paths.PROC_FIPS_ENABLED, 'r') as f:
-            if f.read().strip() != '0':
-                return True
-    except IOError:
-        # Consider that the host is not fips-enabled if the file does not exist
-        pass
-    return False
-
-
 def unescape_seq(seq, *args):
     """
     unescape (remove '\\') all occurences of sequence in input strings.