Skip time sync during client install when using --no-ntp

When --no-ntp is specified during ipa-client-install, we still
attempt to perform a time sync before obtaining a TGT from the
KDC.  We should not be attempting to sync time with the KDC if
we are explicitly told to not configure ntp.

Ticket: https://fedorahosted.org/freeipa/ticket/4842
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

ipa-client/ipa-install/ipa-client-install

@@ -2324,8 +2324,9 @@ def install(options, env, fstore, statestore):
         # hostname if different from system hostname
         tasks.backup_and_replace_hostname(fstore, statestore, options.hostname)
 
-    if not options.on_master:
+    if not options.on_master and options.conf_ntp:
         # Attempt to sync time with IPA server.
+        # If we're skipping NTP configuration, we also skip the time sync here.
         # We assume that NTP servers are discoverable through SRV records in the DNS
         # If that fails, we try to sync directly with IPA server, assuming it runs NTP
         root_logger.info('Synchronizing time with KDC...')