ewaol-[distro,tests]: Execute tests as a 'test' user

This patch brings the following changes:
 - Adds the 'test' user with sudo priveledges via the
   'common-integration-tests' package.
 - Enforce to run all runtime-integration-tests as the 'test' user.
 - Adds expect scripts functionalities:
    * Switches user currently logged into Guest VM, if other than the 'test'
      and run all commands as the 'test' user.
    * Sets 'ewaol123' password if current (empty) password expired,
      e.g. if  DISTRO_FEATURES contains 'ewaol-security'.
 - Adds the 'common-integration-tests' packages as a runtime dependency for all
   runtime integration tests.

Issue-Id: SCM-4414
Signed-off-by: Kamil Dziezyk <kamil.dziezyk@arm.com>
Change-Id: Ib852c0d34222db97d8bdf1679546adc61a59d4dc