add support for a test.properties file to load test system properties

[tucu00]

running testcases often requires specifying real unix users/groups, kerberos principals, JT/NN URI.

running the testcases in different configurations requires different sets of system properties.

Being able to use a test properties file to specify these system properties sets would be very convenient.

Being able to specify different test properties files would make also easier to test different setups without having to specify a long list of of system properties in maven command line.

By default, is a 'test.properties' file exists, its values would be loaded as system properties before running any of the testcases.

If Maven is invoked with the option '-Doozie.test.properties=FILE' an alternate properties file would be used to load the system properties for the testcases run. This would allow having different test properties sets, for example: minicluster, simple & kerberos.

Values specified as options to Maven in the command line override would override values in the test.properties file.

[tucu00]

Closed by 2d9bbac add support for a test.properties file to load test system properties