Increase exercise robustness

* increase some timeouts
* tolerate existing security groups and rules
* add optional DEFAULT_IMAGE_NAME to select the image to boot
* fix image lists via glance

Change-Id: I31ae743e602f69a2c9f872273273f542fc4afda3
diff --git a/openrc b/openrc
index 4395975..0f327d2 100644
--- a/openrc
+++ b/openrc
@@ -53,13 +53,13 @@
 # export NOVACLIENT_DEBUG=1
 
 # Max time till the vm is bootable
-export BOOT_TIMEOUT=${BOOT_TIMEOUT:-15}
+export BOOT_TIMEOUT=${BOOT_TIMEOUT:-30}
 
 # Max time to wait while vm goes from build to active state
-export ACTIVE_TIMEOUT=${ACTIVE_TIMEOUT:-10}
+export ACTIVE_TIMEOUT=${ACTIVE_TIMEOUT:-30}
 
 # Max time from run instance command until it is running
 export RUNNING_TIMEOUT=${RUNNING_TIMEOUT:-$(($BOOT_TIMEOUT + $ACTIVE_TIMEOUT))}
 
 # Max time to wait for proper IP association and dis-association.
-export ASSOCIATE_TIMEOUT=${ASSOCIATE_TIMEOUT:-10}
+export ASSOCIATE_TIMEOUT=${ASSOCIATE_TIMEOUT:-15}