[SSSD] [PATCHES] sssctl: print active server and server list

Failover patches for the sssctl tool. The output looks like:

[master.ipa.pb: ~]$ sudo sssctl domain-status ad.pb Online status: Online

Active servers: AD Global Catalog: root-dc.ad.pb AD Domain Controller: root-dc.ad.pb IPA: master.ipa.pb

Discovered AD Global Catalog servers: - root-dc.ad.pb - invalid.ad.pb - root-dc.ad.pb

Discovered AD Domain Controller servers: - root-dc.ad.pb

Discovered IPA servers: - master.ipa.pb

This is the best output format I could thing of so far, but I'm opened for suggestions.