better validation for resources generated by PuppetX::VMware::Mapper

[nanliu]

There's several resources generated using PuppetX::VMware::Mapper. Currently we validate the input only if it matches mapped property, but we don't actually check if the property hash is valid and don't raise any exceptions i.e the following is invalid but accepted and applied silently with no errors:

typeVMwareDistributedVirtualSwitchTrunkVlanSpec => { ... }

v.s.:

typeVmwareDistributedVirtualSwitchTrunkVlanSpec => { ... }