Major Refactoring and Feature Enhancements
* vmdata.pl works also for freshly created VMs
* Show ESX server in VM overview and VM data
* Show user GECOS field in VM overview
* vm-find.pl can now search for VM name regex
* Remove dependency on vm.conf, all data is now tracked in lab.conf
* vm.conf is still beeing written and contains the full VM dump
* Simplify the code, remove obsolete code parts, more OO style
* Performance improvements by doing more efficient API calls and by
  requesting only relevant properties
* Rework unit tests
  * Do not depend on previous tests for test data
  * Reorder tests: main scripts start with 20-
* Fix a regression bug which would ignore the vsphere network filter
  in lml-maintenance, create test for that feature
* Convert more scripts to new coding and object style