Add AMI tag support to CA-based skeletons. Also recover INDS (panda) validation.
INDS
Note that I also enabled using --AMIConfig as there's no reason why this one should not be used if --AMITag is not set.
--AMIConfig
--AMITag
/cc @nstyles @jcatmore @jchapman @zmarshal @christos @mhodgkin