[releng] Fixed old 2.7.0 version constraints

Change-Id: Ibb4fe8c22b273e120c2e7a0b97c3e5216cbb789a
[454857] Increase BREE and compiler settings to JavaSE-1.6

Change-Id: Ib690b285004951bf39ed53ccf0abb52730e4312b
Signed-off-by: Dennis Huebner <dennis.huebner@itemis.de>