[KARAF-921] Downgrading maven eclipse plugin to 2.6; workaround for a bug in 2.8 Signed-off-by: Andreas Pieber <anpieber@gmail.com> (cherry picked from commit adf057a12f3e1b36c9e2148e212ad38bcc7d5786) Signed-off-by: Andreas Pieber <anpieber@gmail.com>