Increases timeout for guest agent resize_fs
Increases timeout for guest agent resize_fs

When the guest agent resizes the file system, it may take longer
than the AGENT_LOW_TIMEOUT and should use AGENT_HIGH_TIMEOUT to
ensure the resize has sufficient time to complete.

Change-Id: Ic3c030f60ca47d894eb25b83f05b63ef22d519f8
Closes-Bug: #1288766

fabian4/trove,fabian4/trove,mmasaki/trove,zhujzhuo/openstack-trove,cp16net/trove,cp16net/trove,zhujzhuo/openstack-trove,openstack/trove,changsimon/trove,zhujzhuo/openstack-trove,changsimon/trove,fabian4/trove,redhat-openstack/trove,cp16net/trove,hplustree/trove,hplustree/trove,zhangg/trove,changsimon/trove,mmasaki/trove,openstack/trove,mmasaki/trove,zhangg/trove,redhat-openstack/trove,redhat-openstack/trove