Description of problem: When ipa-winsync-migrate command is run on the system
which is not yet configured as ipa-server, the traceback message displayed on
the console should be replaced with user-friendly message saying that 'IPA is
not configured on this system'

Version-Release number of selected component (if applicable): 7.2

How reproducible:Always, when IPA server is not configured on the system

Steps to Reproduce:
1. Login to RHEL7.2
2. Run "yum install ipa-server ipa-server-trust-ad"
3. Ensure "ipa-server-install" is not run.
4. Now do "ipa-winsync-migrate"
5. Now do "ipa-adtrust-install"

Actual results:

4. traceback message is displayed on the console.
[root@ipaserver1 ~]# ipa-winsync-migrate
ipa: WARNING: session memcached servers not running
Traceback (most recent call last):
  File "/usr/sbin/ipa-winsync-migrate", line 23, in <module>
    WinsyncMigrate.run_cli()
  File "/usr/lib/python2.7/site-packages/ipapython/admintool.py", line 124, in
run_cli
    sys.exit(cls.main(sys.argv))
  File
"/usr/lib/python2.7/site-packages/ipaserver/install/ipa_winsync_migrate.py",
line 346, in main
    api.Backend.ldap2.connect(ccache)
  File "/usr/lib/python2.7/site-packages/ipalib/backend.py", line 63, in
connect
    conn = self.create_connection(*args, **kw)
  File "/usr/lib/python2.7/site-packages/ipaserver/plugins/ldap2.py", line 149,
in create_connection
    client_controls=clientctrls)
  File "/usr/lib/python2.7/site-packages/ipapython/ipaldap.py", line 1070, in
gssapi_bind
    '', auth_tokens, server_controls, client_controls)
  File "/usr/lib64/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/lib/python2.7/site-packages/ipapython/ipaldap.py", line 975, in
error_handler
    error=info)
ipalib.errors.NetworkError: cannot connect to 'ldap://localhost:389':

5. Traceback message is not displayed on the console, although
ipa-server-install is not run on the system

[root@ipaserver1 ~]# ipa-adtrust-install
The log file for this installation can be found in
/var/log/ipaserver-install.log
IPA is not configured on this system.


Expected results:
Instead of the traceback message seen in Actual Results 4, the output should be
similar to what we see in Actual Results 5.

Basically replace traceback message with user-friendly message on the console.


Additional info: