CBLT-286:  remove ORIG files after restoring, before javadocs.

This means the build_cblite_android_* jobs should start with a clean workspace.

Change-Id: Ia26cf64a8488191a190f2e6145eb2e3d2bda1295
Reviewed-on: http://review.couchbase.org/36910
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>