bsc: move as_Media arg fail_on_dlcx to pars

Prepare to use fail_on_dlcx in a new test case. Instead of dragging the
parameter through lots of function calls, just add it to pars.

Related: OS#5787
Change-Id: I6f0c4ce543724cc6f18bae9fc2b480f5818db8b7
2 files changed