Add option to specify SID using domain name to idrange-add/mod

When adding/modifying an ID range for a trusted domain, the newly
added option --dom-name can be used. This looks up SID of the
trusted domain in LDAP and therefore the user is not required
to write it down in CLI. If the lookup fails, error message
asking the user to specify the SID manually is shown.

https://fedorahosted.org/freeipa/ticket/3133