Adding support for a remote database

[aleveille]

Submission for supporting node registration to a remote database.

server.cfg properties are straightforward:

plugin.registration.mongohost = host.mongodb.com
plugin.registration.mongoport = 27017
plugin.registration.mongodb = puppet
plugin.registration.mongouser = mcollective-client
plugin.registration.mongopass = password
plugin.registration.collection = nodes
plugin.registration.criticalage = 3600

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