support availability zone for server placement control

Change-Id: Ib9a61a27b4aaa44d48be5e1faa9a5cc3e2efee74
use rpm version of yum validator

Change-Id: I4ef5ed5a1f2fa916193f59a4fbc77dab66356293
remove LBaaS until a working example can be found

Change-Id: I08a373dfc830185407268c332117c5f6b758d07d
update replicant description

Change-Id: Ia029bd62b791f303ea2d0133758c1b69630a4503
update replicant description

Change-Id: I9b7e41a624b32336e927cc2c3414f9293c981443