changes required for 5.5 upgrade
initial network support including vm launch
only update network config when required
null check added
Merge pull request #14 from daniellemayne/develop

Develop: server network config
Merge pull request #12 from maksimov/develop

Develop
Fixed compile problems following addition of resource pools and visible scope.
Changed Vsphere SDK version from 5.5-beta to 5.1 (which actually exists).