ipa-client-install always adds _srv_ entry to sssd.conf even when server specified.

Issue

• ipa-client-install always adds srv entry to sssd.conf even when a server specified

Create new ipa server in a dns domain that you don't have complete control over, meaning you can't add srv records (or modify current existing windows ad records), so you have to create a separate kerberos realm, say ipa.example.com.
ipa-client-install --server=server.example.com --domain -example.com --realm IPA.EXAMPLE.COM
Install succeeds, but has an error Unable to find 'admin' user with 'getent passwd admin'!

Steps to Reproduce:
1. Install ipa client with above command

Actual results:
Unable to find 'admin' user with 'getent passwd admin'!

Expected results:
No errors