avoid Double Bundler by pinning rubygems version
avoid Double Bundler by pinning rubygems version

RubyGems library embeds a version of bundler. To ensure we only have one
version of bundler included in our package, rubygems and bundler must
move together. This version of rubygems embeds bundler 1.17.3 which is
the version of bundler the rest of Supermarket's components expects.

Signed-off-by: Robb Kidd <11cd4f9ba93acb67080ee4dad8d03929f9e64bf2@chef.io>

robbkidd/supermarket,robbkidd/supermarket,robbkidd/supermarket,chef/supermarket,chef/supermarket,chef/supermarket,robbkidd/supermarket,chef/supermarket,chef/supermarket