issue 33

Created by: datum-dpoulin

Issue 33 has been completed with some additional work. The clknrst agent is now responsible for starting the clock generation as well as issuing the reset to the DUT. A new virtual sequence (uvme_cv32_reset_vseq_c) was created to achieve this. The interface uvmt_cv32_clk_gen_if is now considered deprecated.

Also: The test bench and environment flow has been modified: the base test creates and randomizes itself and the env cfg, which is assigned to the env (it also creates the cntxt). The env creates all its components now (uncommented already existing code).