HPCC-10754 Regression suite should have option to have per-target key files

Add new global command line parameter --ignoreResult |-i to completely ignore
the result in both query and run mode.

Add new global command line parameter --keyDir [KEYDIR] |-k [KEYDIR] to use
alternative keyfile directory to compare test output in both query and run
mode.

Add new tag //nooutput handler. If it is exists along with //nokey tag then
the output supressed (doesn't store into log).

Change key file handling. RS try to use keyfile in cluster related
sub-directory first. It keyfile doesn't exist there RS try to use it
from KEY subdiretory.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>