packaging: setup: ssl2jkstrust: read chain from connection and not from context

this provides the entire chain in more cases, although should be the
other way around.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1058016
Change-Id: I7e0ae4735cc1ef772e3c703d9bb04e6a01c07532
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>