Update WinMSSQL.py & utils.py

cheap fix for the default value of zDBInstances (MSSQLSERVER;) causing the "Error parsing..." message to be thrown since python creates a list with two values ["MSSQLSERVER", ""]. The 2nd instance is an empty string so it dies.
Merge branch 'develop' of https://github.com/ss10sb/ZenPacks.zenoss.Microsoft.Windows into develop

Conflicts:
	ZenPacks/zenoss/Microsoft/Windows/modeler/plugins/zenoss/winrm/WinMSSQL.py