Limit heap size in Groovy integration tests

Configure maven to limit heap size in integration tests to
help detect OutOfMemory errors in groovy tests.
The figure 512MB was chosen as this is 25% of 2GB
(JVM by default uses 25% of total memory for heap).

Issue-ID: CPS-2052
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: Ie1160f85ba3970e4c43fccee41c2821dc83a8e53
1 file changed