Fix wait_for_compute to work for modified compute host name

When we change the name of compute host then devstack is breaking
because it is using default host name from host.

How to change compute host name in local.conf
[[post-config|$NOVA_CONF]]
[DEFAULT]
host = foo

Change-Id: I4d4392f1f58f0431b10764610668565af88d392f
Signed-off-by: Prabhat Ranjan <pranjank@in.ibm.com>

Author: pranjank

functions

@@ -441,7 +441,12 @@ EOF
 function wait_for_compute {
     local timeout=$1
     local rval=0
+    local compute_hostname
     time_start "wait_for_service"
+    compute_hostname=$(iniget $NOVA_CONF DEFAULT host)
+    if [[ -z $compute_hostname ]]; then
+        compute_hostname=$(hostname)
+    fi
     timeout $timeout bash -x <<EOF || rval=$?
         ID=""
         while [[ "\$ID" == "" ]]; do
@@ -450,7 +455,7 @@ function wait_for_compute {
                 # When using the fake driver the compute hostnames have a suffix of 1 to NUMBER_FAKE_NOVA_COMPUTE
                 ID=\$(openstack --os-cloud devstack-admin --os-region "$REGION_NAME" compute service list --host `hostname`1 --service nova-compute -c ID -f value)
             else
-                ID=\$(openstack --os-cloud devstack-admin --os-region "$REGION_NAME" compute service list --host `hostname` --service nova-compute -c ID -f value)
+                ID=\$(openstack --os-cloud devstack-admin --os-region "$REGION_NAME" compute service list --host "$compute_hostname" --service nova-compute -c ID -f value)
             fi
         done
 EOF