Add support for some missing processing of state which is detected by Khronos CTS

Add support for some missing processing of state which is detected by Khronos CTS

Modification including:
1. Add missing contest states and related processing like
gl_shader_storage_buffer_binding
2. Rename all context states in the from of gl_num_xxx
to gl_xxx_num, for convenient macro processing in
fastpath_glBindBuffer()
3. Clear all buffer binding related state arrays which are
set in fastpath_glBindBufferBase() if argument buffer 0 is
passed to fastpath_glBindBuffer()

Signed-off-by: Zhaowei Yuan <zhaowei.yuan@samsung.com>
Change-Id: Ie28eaac2bdff8299c4575e6415c34ae41273f39f