ewaol-tests: Allow executing tests for users other than 'root'

This patch brings the following changes:
 - Adds 'sudo -n' to each call (e.g.: docker, kubectl, systemctl)
   that requires 'sudo' priveledges.
 - Changes the logging directory to '${HOME}/runtime-integration-tests-logs'.
 - Allows changing the default timeout for executing test commands inside
   the Guest domain.
 - Increases the timeout for container subtest 'Run tests on Guest VM'
   to 120 seconds.

Issue-Id: SCM-4414
Signed-off-by: Kamil Dziezyk <kamil.dziezyk@arm.com>
Change-Id: I4d75bac7ade4e5d8f5272b966126ad9cde2bb972