update SSL cipher list for OTRS to support PFS

this is the same list of ciphers we use
on the main cluster nginx frontends since
recently (I830bec497338a36f)

also use it for ticket/OTRS to support
Forward Secrecy

bug: 53259
Change-Id: Idd59492b36e78d92fa5d719cec0a51494c9b8a61
Merge "update SSL cipher list for OTRS to support PFS" into production