JCBC-232: Renaming javadocs to javadoc for standard compl.

This changeset renames the resulting mvn jar files for javadocs
from javadocs to javadoc to conform with IDE and repository
standards.

Change-Id: I1377f35cd249e109918b5ee9c966178e68b4b40d
Reviewed-on: http://review.couchbase.org/24652
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Reviewed-by: Tugdual Grall <tugdual@gmail.com>
Reviewed-by: Deepti Dawar <deepti.dawar@globallogic.com>
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>