share chapters/gsup.adoc from OsmoSGSN to OsmoMSC + OsmoHLR

Since the NITB split, GSUP is used in all three network elements, so
make the protocol a shared chapter

Change-Id: Id2d7c27ef16eb0ebe5f60d625a1fcf42f1603f4f
1 file changed
tree: 409941245285a2d0e9e5b34477e20f00d5dc8c9b
  1. doc/