MOTECH-1093 and MOTECH-1094 | Refactor OpenMRS modules

Remove all OpenMRS modules aside from web services (REST API),
and remove the abstract MRS module. Rename the module to reflect
the version of OpenMRS that it supports (this module supports 1.8
and 1.9).

Note that the ITs are disabled (they have apparently been broken
for some time). Re-enabling them and migrating them to PAX is tracked
by MOTECH-1144. Tasks support for the new OpenMRS module is tracked
by MOTECH-1155.

Change-Id: Ic58fd63f5c7d6a5861b4b0c627ee2af8eba8752a