(PUP-2889) Eventlog specs pending Windows 2003

 - win32-eventlog gem upgraded from 0.5.3 to 0.6.1 as part of
https://github.com/puppetlabs/puppet/commit/ac8d4e257f69beaf87489b2e2a57f8aaab512edc
 - win32-eventlog gem 0.6.1 doesn't yet include the patch necessary to
   properly load it on 2003 from:
https://github.com/djberg96/win32-eventlog/commit/4692e2a67ae8dc794981928d6e6488b775a6689a
 - Therefore, mark these eventlog tests as pending on 2003 until the
   0.6.2 gem ships and the Gemfile can be updated
 - These guards will be removed as part of PUP-3061