Bug 1102562 - [eap6] Make DomainController's Domain name configurable

Domain Name is now part of resourceConfiguration for DomainController and
HostController resources. Only DC's are allowed to change this configuration
(handled by EAP). As 'Domain Name' is not available (and known) from EAP
admin console, there's a high chance it's unconfigured (having default value
'Unnamed domain').
Merge pull request #48 from lzoubek/bugs/1102562

Bug 1102562 - [eap6] Make DomainController's Domain name configurable