Fix Xorg-server on vmware inconjunction with fix to
xf86videovmware[1].

Adds "vmware" to list of default options of
services.xerver.videoDrivers.

new default:
 [ "ati" "cirrus" "intel" "vesa" "vmware" ]

old default:
 [ "ati" "cirrus" "intel" "vesa" ]

[1] Pull request for xf86videovmware found at
https://github.com/NixOS/nixpkgs/pull/338.
Remove vmware comment
Fix nixos test driver startJob function. It was stopping the job before.
Merge pull request #107 from Davorak/fixXorgVMware

Fix Xorg-server on vmware inconjunction with
Revert "Add /run/nss to LD_LIBRARY_PATH".

Commit c948494342581e7c31880c1d3f2a3f9e618bc963 exports too many shared
objects into the LD_LIBRARY_PATH, which causes problems with mplayer.