Rename the 'tests' directory to 'ipa-tests', and create an ipa-tests RPM
containing the test suite

Part of the work for: https://fedorahosted.org/freeipa/ticket/3654

IPA has some unused code from abandoned features (Radius, ipa 1.x user
input, commant-line tab completion), as well as some duplicate utilities.
This patch cleans up the utility modules.

Duplicate code consolidated into ipapython.ipautil:
    {ipalib.util,ipaserver.ipautil,ipapython.ipautil}.realm_to_suffix
    {ipaserver,ipapython}.ipautil.CIDict
            (with style improvements from the ipaserver version)
    {ipapython.entity,ipaserver.ipautil}.utf8_encode_value
    {ipapython.entity,ipaserver.ipautil}.utf8_encode_values

ipalib.util.get_fqdn was removed in favor of the same function in
ipaserver.install.installutils

Removed unused code:
    ipalib.util:
        load_plugins_in_dir
        import_plugins_subpackage
        make_repr (was imported but unused; also removed from tests)

    ipapython.ipautil:
        format_list
        parse_key_value_pairs
        read_pairs_file
        read_items_file
        user_input_plain
        AttributeValueCompleter
        ItemCompleter

    ipaserver.ipautil:
        get_gsserror (a different version exists in ipapython.ipautil)

ipaserver.ipautil ended up empty and is removed entirely.

https://fedorahosted.org/freeipa/ticket/2650

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