Added parameter for "terse" to Asadmin used in tests

[dmatej]

It follows usual scenarios:

• Usually we process the output by a software, most often we just need to know if it succeeded (which is signaled by the exit code 0), so there is no need to parse the Command succeeded message.
• But sometimes we do exactly opposite.
• Both ways usually differ by test class, sometimes by a test method.

The second change is about creating a backup of domain properties set by asadmin set and retrievable by asadmin get. (they can be manipulated also by other commands, like create-jdbc-pool, etc).

@OndroMih recently created this feature, this PR brings refactored and simplified version using the terse output and minimalistic api.