Fix modulepath in puppet master

When installing a puppet master on the build node, the modulepath
has been getting set with a single path (/etc/puppet/modules).
Puppet typically defaults to both that path and
/usr/share/puppet/modules.  Since most of our packages install
in the latter path, this is problematic.  This commit adds
the missing second path.

Closes-Bug: #1262003
Merge pull request #28 from CiscoSystems/bugs/1262003

Fix modulepath in puppet master