Changes

[582465] A few MAT tests fail with german language / region

Fix by adding -Duser.language=en -Duser.region=US explicitly to the
tests arguments

Change-Id: Ic7b454fc7b2abc6bb23f645ee40338ce73284fae
Signed-off-by: Krum Tsvetkov <krum.tsvetkov@sap.com>

[582466] RCP UI tests VM won't start because of obsolete -XX:MaxPermSize

Remove the parameter completely, assuming it is not required any longer
because of new defaults

Change-Id: I36bfc7922b4940cd55a1b0fefdc6961f40704f0e