Set deploywait_timeout via localrc option

Currently a hardcoded value is used for the DEPLOYWAIT timeout in
tempest. The patch in review 269249 adds a config option to use
instead of this hardcoded value. This patch allows the value to be
set via the BUILD_TIMEOUT variable.

Change-Id: Id79014fd6e07f93029111f6c28e3537e2e39be9f
Related-Bug: 1526466
diff --git a/lib/tempest b/lib/tempest
index fd98c94..621bd62 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -462,6 +462,7 @@
         iniset $TEMPEST_CONFIG baremetal driver_enabled True
         iniset $TEMPEST_CONFIG baremetal unprovision_timeout $BUILD_TIMEOUT
         iniset $TEMPEST_CONFIG baremetal active_timeout $BUILD_TIMEOUT
+        iniset $TEMPEST_CONFIG baremetal deploywait_timeout $BUILD_TIMEOUT
         iniset $TEMPEST_CONFIG baremetal deploy_img_dir $FILES
         iniset $TEMPEST_CONFIG baremetal node_uuid $IRONIC_NODE_UUID
         iniset $TEMPEST_CONFIG compute-feature-enabled change_password False