Check conflict handling for version.rb _and_ Rakefile

MSP-11103

Move conflict feature out of version because conflicts need to be
checked for both version.rb and Rakefile.
Fix expected version.rb to use patch default of 1

MSP-11103

Update expected version.rb in features to use 1 for PATCH instead of 0
to match change to --patch default from 0 to 1.
install <namespace>_spec.rb

MSP-11103

`metasploit-version install` will generate <namespace>_spec.rb to check
that GEM_VERSION and VERSION is defined proper.