addresses #1191 - Add VMWare virtualhw.version configuration option under 'version'
 #1191 - highlight 'experimental' state of VMWare vmx.version in docs

As per the comments on the pull request It was felt that vmx hardware
version should be more explicitly documented as ‘experimental’ when
using a non default value.
Merge pull request #1530 from Quintok/master

#1191 - Add VMWare virtualhw.version configuration option under 'version'