LP#1612771: bundling and chunking

LP#1612771: bundling and chunking

This patch is first in a series of patches that provides the following
features:

* OpenSRF message bundling -- Pack multiple OpenSRF messages together
in a single XMPP envelope, as long as we believe more messages will be
sent in the future and we are below some threshold of combined message size.
The default for that threshold is 25Kb.

 * OpenSRF message chunking -- Break up large OpenSRF messages across
multiple XMPP envelopes. This is implemented with a new OpenSRF message type.
C, Perl, and Javascript libraries are taught how to reconstruct chunked
messages. The default chunking threshold is 50Kb, just a bit below the default
ejabberd max stanza size of 64Kb.

This patch in particular renames "chunking" to "bundling", then
implements message splitting ("chunking") in Perl using two new
oilsResult subclasses

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>