rfe12590: events tests with shared backends

When passing --shared the events test uses shared backends instead of
dedicated sessions.

tests run: java event tests
release note: no, internal change

Change-Id: Ic6e6f24dd42898beedab2af96458e9434aa46b34
Reviewed-on: https://gerrit.franz.com:9080/3397
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Reviewed-by: John O'Rourke <jor@franz.com>
Tested-by: Kevin Layer <layer@franz.com>
rfe12743: (test only) remove some spurious warnings and error messages from the log

tests added    : no (changed)
tests run      : agtest.sh 2
performance    : no change
release note   : none, test change only

Change tests to match new condition string.

Change-Id: Ica8cc8731ba6849b53952b0e09bae57199b0ffe5
Reviewed-on: https://gerrit.franz.com:9080/3595
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Reviewed-by: John O'Rourke <jor@franz.com>
Tested-by: Kevin Layer <layer@franz.com>