[P4Ruby] enable streams by default
Fixed S_STREAMS bit mask to 0x0040 and changed the initial
state S_INITIAL_STATE bit 0x0041 to enable streams by default.
Added logic to set streams for API levels greater than 69
Add streams test case - tests the output of 'P4::run_depots' for different
settings of 'P4::streams' and 'P4::api_level'