Fixed Coverity reported type issues
CLOUDSTACK-7241: Fixed error in test_escalations_ipaddresses.py

Signed-off-by: Santhosh Edukulla <santhosh.edukulla@gmail.com>
Removing invalid import from test_escalations_templates.py

Signed-off-by: Santhosh Edukulla <santhosh.edukulla@gmail.com>
CLOUDSTACK-7255: Fixed marvin issue related to creating random account usernames

Signed-off-by: Santhosh Edukulla <santhosh.edukulla@gmail.com>