bugzilla - remove DHE ciphers

though already deactivated with !DH,
still remove these ciphers:

DHE-RSA-AES128-GCM-SHA256:kEDH+AESGCM

as explained in I39b389b63ae6b8 it was an oversight,
and we just copied from the nginx cluster config
for misc. services

Change-Id: I2e48991d4119a2ed8910d1a977eafc35863a7db7
Merge "bugzilla - remove DHE ciphers" into production