metrics: stop hypervirsor and shim at init_env stage

This PR kills the hypervisor and the kata shim in the
init_env stage prior to launch any metric test.
Additionally this PR adds info messages in the main blocks
of the blogbench test to help in debugging.

Fixes: #7366

Signed-off-by: David Esparza <david.esparza.borquez@intel.com>

tests/metrics/lib/common.bash

@@ -178,6 +178,7 @@ function init_env()
 	# This clean up is more aggressive, this is in order to
 	# decrease the factors that could affect the metrics results.
 	kill_processes_before_start
+	info "init environment complete"
 }
 
 # This function checks if there are containers or