The configure() in SystemConfigService method has been modified to
log only the error message in normal responses but log the full
stack trace when unexpected issues occur.

The validateData() in SystemConfigService has been renamed to
validateRequest() for clarity. The log messages have been modified
to include the invalid values entered in the request.

This patch adds the ability to create a subsystem that uses
an existing subtree to create the internal basedn.  This is useful
for instance, for IPA which will use the original o=ipaca as the
top level DN for a KRA, which will be situated at o=ipadrm, o=ipaca.

The patch also allows such a system to be cloned, but not to setup the
replication agreements, on the assumption that the data is already being
replicated at the top-level DN or some higher level.

The patch also contains some minor cleanups - removing unused imports and
removal of an invalid reference in the python code.

Ticket 1051

The KeyClient class on the java side is modified to
have a similar design as the KeyClient class on the python side.

Previously the CLI authentication could fail because it's using a
fixed default subsystem which may not match the command it's trying
to execute. The CLI has now been modified to use the appropriate
default subsystem depending on the command to be executed.

A new Client class was added as a base for all client classes. The
SubsystemClient was added as a base for all subsystem clients. It also
provides methods to authenticate against the subsystem. The DRMClient
has been renamed to KRAClient to match the actual subsystem name.

Ticket #701

Connection is now made to the installation servlet through a python
client using JSON.  The code to construct the ConfgurationRequest and
parse the results has been moved to pkihelper.py, and configuration.py
no longer calls a separate jython process to create the Configuration
object and parse the results.  The jython code has therefore been removed.

Also added status servlet to other java subsystems, to be tested prior
to starting configuration.

Trac Ticket 532

The pki-client.jar has been split and merged into pki-certsrv.jar
and pki-tools.jar. The REST client classes are now packaged in
com.netscape.certsrv.<component> packages. The REST CLI classes
are now packaged in com.netscape.cmstools.<component> packages.
The "pki" script has been moved into pki-tools RPM package.

Ticket #215

The common classes used by REST client and services have been moved
into the com.netscape.certsrv.<component> packages.

Ticket #215

The REST client classes have been moved into the
com.netscape.cms.client.<component> packages.

Ticket #215

The REST common classes have been renamed for better clarity
and consistency.

Ticket #259