Allow users to change the default provisioning timeout value

900 seconds is enough for small images but the larger the image becomes
the more time we need to add it to a host, so allow users to override
the default value by using the PROVISION_WAIT_TIMEOUT variable.

Change-Id: Ia5f35bdf61fa2c8ad348d2a3a7fe181dbe06b096

scripts/test-bifrost.sh

@@ -35,6 +35,7 @@ INVENTORY_DHCP_STATIC_IP=false
 DOWNLOAD_IPA=true
 CREATE_IPA_IMAGE=false
 WRITE_INTERFACES_FILE=true
+PROVISION_WAIT_TIMEOUT=${PROVISION_WAIT_TIMEOUT:-900}
 
 # NOTE(cinerama): We could remove this if we change the CI job to use
 # USE_DHCP, BUILD_IMAGE, etc.
@@ -135,7 +136,8 @@ ${ANSIBLE} -vvvv \
     -e inspect_nodes=${INSPECT_NODES} \
     -e download_ipa=${DOWNLOAD_IPA} \
     -e create_ipa_image=${CREATE_IPA_IMAGE} \
-    -e write_interfaces_file=${WRITE_INTERFACES_FILE}
+    -e write_interfaces_file=${WRITE_INTERFACES_FILE} \
+    -e wait_timeout=${PROVISION_WAIT_TIMEOUT}
 EXITCODE=$?
 
 if [ $EXITCODE != 0 ]; then