Fog::Connection mixed in XML parsing via the `parser` argument which
wasn't much use for the majority of APIs using JSON.
This adds the deprecation warning and attempts to update providers to
the correct version of Connection that they need.
Either the cleaner `Fog::Core::Connection` or if reliant on the XML
parsing still `Fog::XML::SAXParserConnection`
The SAX parser will be moving to `fog/xml` fairly soon.
Following work on reorganising the requires, there was an inconsistent
approach to where service wrappers are required. (Fog::Compute...)
Since they should be standardised and shared across providers (although
they really aren't yet) they have been moved to `fog-core` gem.
Each provider has their own `lib/fog/{provider}/core` files that is
required by each of their services. These files should all require
`fog/core` which already required most or these.
So this removes the extra cases to concentrate them in core.
Adding support for listing networks in the Joyent Cloud.
:joyent_version was defined in a way that it would always
fall back to the default '~6.5'. Creating servers with
a particular network requires setting :joyent_version to '~7.0'
or greater.
This reverts commit 6e93321e29.
The reason for reverting this is Joyent's CloudAPI allows authenticating using
either a username/password credential pair OR using a username and SSH private key.
In http-signature authentication scheme, no password is used.
