Updated error message in MGT_Child_Cli_Fail
Updated error message in MGT_Child_Cli_Fail

Updated error message in MGT_Child_Cli_Fail to indicate that we
actually have sent the kill signal to the child process.

feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache