Replace deepcopy with constructor (i.e. type call)
Can now "clone" with configuration changes by passing object
of the same type to it's constructor, e.g.
dn1 = DN(('cn', 'foo'))
dn2 = DN(dn1)
dn2 = DN(dn1, first_key_match=False)

Remove pairwise grouping for RDN's. Had previously removed it
for DN's, left it in for RDN's because it seemed to make sense
because of the way RDN's work but consistency is a higher goal.

Add keyword constructor parameters to pass configuration options.

Make first_key_match a configuration keyword.

Updated documentation.

Updated unit test.

FWIW, I noticed the unittest is now running 2x faster, not sure why,
removal of deepcopy? Anyway, hard to argue with performance doubling.

The pairwise grouping used to form RDN's and AVA's proved to be
confusing in practice, this patch removes that functionality thus
requiring programmers to explicitly pair attr,value using a tuple or
list.

In addition it was discovered additional functionality was needed to
support some DN operations in freeipa. DN objects now support
startswith(), endswith() and the "in" membership test. These functions
and operators will accept either a DN or RDN.

The unittest was modified to remove the pairwise tests and add new
explicit tests. The unittest was augmented to test the new
functionality. In addition the unittest was cleaned up a bit to use
common utilty functions for improved readabilty and robustness.

The documentation was updated.

fix test_role_plugin use of DN to avoid pairwise grouping

Allow a long to get as far as the min/max constraints where we can
compare it to min/max int values and reject with a proper error message.

https://fedorahosted.org/freeipa/ticket/1494

In order for this to work, chaining of parameters through
default_from is made possible.

ticket 1474

The hostname is passed in during the server installation. We should use
this hostname for the resulting server as well. It was being discarded
and we always used the system hostname value.

Important changes:
- configure ipa_hostname in sssd on masters
- set PKI_HOSTNAME so the hostname is passed to dogtag installer
- set the hostname when doing ldapi binds

This also reorders some things in the dogtag installer to eliminate an
unnecessary restart. We were restarting the service twice in a row with
very little time in between and this could result in a slew of reported
errors, though the server installed ok.

ticket 1052

Ticket #903