Ticket #903

This patch removes some individual work-arounds of converting strings
to unicode, they only masked the problem. String values are not
passed to the validator or normalizers so things like adding the
realm automatically to services weren't happening.

ticket 941

It isn't safe to assume there is an environment or mode in any given
object. Only skip the extra work if the object explicitly has production
in it.

In Python 2.7 the API for time.utcoffset() changed.

We do more automatic conversions of strings so need to loosen the tests
a bit.

This patch contains 2 parts.

The first part is a small utility to create and validate the current
API. To do this it needs to load ipalib which on a fresh system
introduces a few problems, namely that it relies on a python plugin
to set the default encoding to utf8. For our purposes we can skip that.
It is also important that any optional plugins be loadable so the
API can be examined.

The second part is a version exchange between the client and server.
The version has a major and a minor version. The major verion is
updated whenever existing API changes. The minor version is updated when
new API is added. A request will be rejected if either the major versions
don't match or if the client major version is higher than then server
major version (though by implication new API would return a command not
found if allowed to proceed).

To determine the API version of the server from a client use the ping
command.

ticket 584

The changes include:
 * Change license blobs in source files to mention GPLv3+ not GPLv2 only
 * Add GPLv3+ license text
 * Package COPYING not LICENSE as the license blobs (even the old ones)
   mention COPYING specifically, it is also more common, I think

 https://fedorahosted.org/freeipa/ticket/239

https://fedorahosted.org/freeipa/ticket/397

ticket 496