Normalize some error message strings to make maintenance (i.e., changing said error messages) a bit easier.

Signed-off-by: Rajani Karuturi <rajanikaruturi@gmail.com>
CLOUDSTACK-7763 Reservations for VMware VMs remain after dynamic scaling
CLOUDSTACK-7760 Data disk size is not considering for primary storage resource limit check
CLOUDSTACK-7851:MS does not start after the VM it is running on is rebooted
CLOUDSTACK-7843: sync Job Failures always reported as success on Event Bus
CLOUDSTACK-7830: Usage Job fails with "Data too long for column 'user_name'"