Add akumria/puppet-nullmailer module

Actually a fork of this module to address issues and submit a PR
for inclusion.
Patch against proletaryo/puppet-nagios-nrpe was accepted

Since my patch to correct the template issue was accepted by upstream
I've reverted back to the main repository instead of my forked one.
Add razorsedge/puppet-snmp submodule
Add attachmentgenie/puppet-module-locales module
Move ssh module to jbouse/puppet-ssh fork to fix problem

Pull request submitted upstream to spiette/puppet-ssh for inclusion.
Will revert back to upstream repo when fix has been included.
Modify account lookups in base

Use hiera_hash() for cascaded lookups
Add addition of default value hash lookup