Update gitignore file
Update gitignore file

Ignore Gemfile.lock file and spec site.pp file

Change-Id: I44eca1412b771fb78eecf65c7801d8585336d43f

varunarya10/puppet-nova,pllopis/puppet-nova,datacentred/puppet-nova,varunarya10/puppet-nova,larsks/puppet-nova,TelekomCloud/puppet-nova,JioCloud/puppet-nova,arnaudmorinol/puppet-nova,javiplx/puppet-nova,DylanYu/puppet-nova,datacentred/puppet-nova,madkiss/puppet-nova,JioCloud/puppet-nova,cristifalcas/puppet-nova