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The --nodes option in gnt-backup really accepts only one node at a time.
Change it to --node, for added clarity and consistency with a similar
option in gnt-cluster. This patch also updates the relevant man page.

Reviewed-By: iustinp

Replace --secondary-node option with an optional parameter for --node.

Reviewed-by: ultrotter

This patch allows 'gnt-instance add' to not start the newly-created
instance. It also allow 'gnt-instance add' and 'gnt-backup import' to
not check for IP conflicts (only when not starting the instance).

Reviewed-by: ultrotter

This changes the raising of exceptions from:
  raise Exception, value
to
  raise Exception(value)

as the first form will be removed in python-3000 and the second form is
preferred now.

The changes also involve a few cases of changing from raising standard
exceptions and use our own ones.

The new version also fixes many pylint-generated warnings, especially in
ganeti-noded where I changed many methods to @staticmethod.

There is no functionality changed (barring any bugs).

- Implement “gnt-instance reinstall”
- Fix two typos

Reviewed-by: iustinp

Reviewed-by: iustinp

Reviewed-by: imsnah