Improve log level conf for Sahara

* set verbose to True
* set debug to $ENABLE_DEBUG_LOG_LEVEL

Change-Id: I229f6ed7c13caf7bea9c090de43ede4ed9ea1536
Ironic: Use HOST_IP instead of SERVICE_HOST

Ironic virtual machines boot on a different network and are expected
to fetch via tftp from the conductor and callback to the API.  We
need to ensure both endpoints are accessible, even when SERVICE_HOST
is 127.0.0.1 (eg, devstack-gate).

Change-Id: I96aee75b76ad11d83143736da00ea304db971c9c
VMware: Use multiline for cluster_name opt

cluster_name opt for vSphere driver is MultiStrOpt and currently
users are not able to set multiple values from localrc. This is
fixed by using iniset_multiline function.

Thus, new usage would be :
VMWAREAPI_CLUSTER='cluster1 cluster2 cluster3'
where c1, c2, c3 are the name of the clusters

Change-Id: Ie0f3a48614e6134d849050754932a3613363ce66
Merge "Improve log level conf for Sahara"
Merge "VMware: Use multiline for cluster_name opt"
Merge "Ironic: Use HOST_IP instead of SERVICE_HOST"
Merge branch 'master' of github.com:openstack-dev/devstack