sso: test program pipeline with atomic counters

sso: test program pipeline with atomic counters

Test fails on current Mesa (i965 BDW) but passes on NVIDIA binary
driver version 355.11 and AMD binary driver version 15.201.1151.

v2: add error checks
    modify to render points
    make it possible to use regular program (makes test pass on Mesa)

v3: bump up glsl version to 1.50 and redeclare gl_Position in vs
    (makes the vs compile and test pass on AMD)

v4: simplify and modify test to make sure to draw all pixels
    (makes the test pass on NVIDIA, previously likely all pixels
     just got clipped away)

v5: doh, do not free objects in piglit_display(), it can get called
    multiple times ..

v6: code cleanups, remove REGULAR_PROGRAM define

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>