group-show: resolve external members of the groups

Perform SID to name conversion for existing external members of the
groups if trust is configured.

https://bugzilla.redhat.com/show_bug.cgi?id=1054391
https://fedorahosted.org/freeipa/ticket/4123
Remove SID resolve call from Web UI

- it's called in group-show

https://bugzilla.redhat.com/show_bug.cgi?id=1054391
https://fedorahosted.org/freeipa/ticket/4123
ipa-adtrust-install: configure host netbios name by default

Ensure we set host netbios name by default in smb.conf

https://fedorahosted.org/freeipa/ticket/4116