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