Added Fix for CLOUDSTACK-5875

Added fix for exception and listing. Mentioned details under bug.
Post the fix, simulator works fine.

Signed-off-by: Santhosh Edukulla <Santhosh.Edukulla@citrix.com>
Signed-off-by: Koushik Das <koushik@apache.org>
CLOUDSTACK-5938 Failing add host in security group enabled zone, when CSP is not installed
CLOUDSTACK-2031:support for number of ips per nic limit needs to be added for the multiple ip address per nic
CLOUDSTACK-5810 updated null checks and preparestmt and resultset close

Closing the prepare statement and result set and assigning null to the object after close.
Add configuration to the reporting section of the pom so we have findbugs and cobertura output in the site output.
Findbugs finding: Fix potential NPE
Findbugs finding: Fix incorrect comparison, <VbdType>.equalsi(<String>) will always be false and should be <VbdType>.equals(<VbdType>)
Findbugs finding: the collections should have been made static
Findbugs finding: Fix object comparison with == instead of equals
Findbugs finding : Fix potential NPE
test: Add UnitTest for LibvirtSecretDef