tests: create a test to check for mon_initial_members
tests: create a test to check for mon_initial_members

Signed-off-by: Alfredo Deza <adeza@redhat.com>

Resolves: pytest#harness

font/ceph-ansible,albertomurillo/ceph-ansible,bengland2/ceph-ansible,fgal/ceph-ansible,guits/ceph-ansible,jsaintrocc/ceph-ansible,travmi/ceph-ansible,ceph/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,WingkaiHo/ceph-ansible,jtaleric/ceph-ansible,albertomurillo/ceph-ansible,bengland2/ceph-ansible,font/ceph-ansible,guits/ceph-ansible,WingkaiHo/ceph-ansible,jtaleric/ceph-ansible,jsaintrocc/ceph-ansible,WingkaiHo/ceph-ansible,travmi/ceph-ansible,albertomurillo/ceph-ansible