ipatests: Test for ipa-nis-manage CLI tool.
The testcases added check the various options of ipa-nis-manage CLI
tool as below
1. ipa-nis-mange enable
2. ipa-nis-manage disable
3. Enabling NIS pluging with invalid admin password
Reviewed-By: Mohammad Rizwan <myusuf@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>