Remove redundant declarations and simplify ../ in pathing
- TESTSBASE and LOCALBASE are already defined in bsd.tests.mk
- TESTSDIR is automatically divined as ${TESTSBASE}${RELDIR:H} after r289158.
- Replace SRCDIR with SRCTOP
MFC after: 1 week
X-MFC with: r305019
Sponsored by: EMC / Isilon Storage Division