internal.py: report more-accurate info about locked machines
internal.py: report more-accurate info about locked machines

Don't hide the fact that there are reserved machines that may
cause a scheduled lock request to have to wait.

Fixes: 9914
Signed-off-by: Dan Mick <b07550071eaa6a9296289c43bbd6c90559196431@redhat.com>

zhouyuan/teuthology,robbat2/teuthology,ceph/teuthology,michaelsevilla/teuthology,SUSE/teuthology,tchaikov/teuthology,dmick/teuthology,dmick/teuthology,SUSE/teuthology,ktdreyer/teuthology,robbat2/teuthology,zhouyuan/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,t-miyamae/teuthology,ivotron/teuthology,t-miyamae/teuthology,ivotron/teuthology,dreamhost/teuthology,ceph/teuthology,dmick/teuthology,SUSE/teuthology,tchaikov/teuthology,yghannam/teuthology,caibo2014/teuthology,caibo2014/teuthology,dreamhost/teuthology,yghannam/teuthology