use trans-id in opaque networks

using cluster-id in opaque network strings was not that convinient as it is hard to track the request that triggers particular network exchange
now the opaque string will use tx.... transaction id from Swift logs
make test_cors run with older Swift versions
Merge pull request #71 from pkit/job_manager

use trans-id in opaque networks
Merge pull request #70 from pkit/minor_fixes

make test_cors run with older Swift versions
added sysimage config to container servers

will be used in future tests
otherwise will forget it