Add generic PasteDeploy app and filter factories

These generic factories allow us to dump copied and pasted
app_factory and filter_factory methods.

The main difference is the paste configuration changes from:

  [app:myapp]
  paste.app_factory = myapp:app_factory
  ...
  [filter:myfilter]
  paste.filter_factory = myapp:filter_factory

to this:

  [app:myapp]
  paste.app_factory = openstack.common.pastedeploy:app_factory
  openstack.app_factory = myapp:App
  ...
  [filter:myfilter]
  paste.filter_factory = openstack.common.pastedeploy:filter_factory
  openstack.filter_factory = myapp:Filter

Apart from reducing code duplication, this will also allow us to have
the generic factories inject other data into the apps and filters.

This could implemented as a new feature in PasteDeploy itself - e.g.
allow the loadapp() caller supply a python object which is passed on
to the factories.

In the meantime, Glance has code like this to pass a ConfigOpts instance
to factories. Keystone is moving a similar way, as will other projects
as they move away from a global config object.

Change-Id: I928d1f6da154f0f41edd624e25b8918a0e12cb28

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