Changes

mgw: Split CRCX read-only validations into its own function

The SDP parsing is moved to a step beforehand, so that validation of
full message can be done in a subsequent step. That validation step is
moved into a function to give some air to handle_create_con() and easily
spot the logic.

The logic based on force_realloc is split so that code modifying the
object is moved to the later update step.

Change-Id: I639ad0a25a0af4a4637045ca8bf61e436a789426

mgw: Increment rate_ctr MGCP_*_FAIL_UNHANDLED_PARAM during parsing

We could not do it before because we had no easy access to the command
verb being parsed. Now that we have access to it, bettter increase it
where we have exact path where stuff happens.

Change-Id: I3ea45fc1d25284b253ac9b7f0c0a925c10c994ca

mgw: Split MDCX read-only validations into its own function

The SDP parsing is moved to a step beforehand, so that validation of
full message can be done in a subsequent step. That validation step is
moved into a function to give some air to handle_modify_con() and easily
spot the logic.

Change-Id: I469413dbe89cc4795deb50d76b434655cba9b776

mgw: Split MDCX read-only validation on conn into its own function

Add a second read-only validation step once the conn to be modified is
found in the endpoint.

Change-Id: I025ca5352eff9ee35c977c69b71934513646b1f2

mgw: Split DLCX read-only validations into its own function

Similar to what's already done in CRCX and MDXC.

Change-Id: I3d86f0cbeacc7c0cd69809f898714a76d3b86ed0

mgw: CRCX: Handle codec information before initializing osmux

Same order as done during MDCX. This way we can also eg. check
configured codec is AMR before successfully entering configuring osmux.

Change-Id: If291db0c048196e6e0eee2c38e648e5a25438078

mgw: Drop rtp_processing transcoding stubs

This has never been used afaik, and it's only clogging the code and
adding extra indirect function pointer calls to hot paths for no good
reason.
Drop all of it, and re-ad whatever makes sense once someone really wants
to implement transcoding.

Change-Id: Id16af528d94612e771f94333ad5404e5cd1c3318

mgw: Rearrange last steps of CRCX and MDCX

Make code in CRCX and MDCX look closer, since it is really doing the
same.
Move the dummy ping code after everything has been done correctly, since
the ping is just a side effect of the conn being created.

Change-Id: I42acda16cb2d59a9b7aae06b7584d4dfc1e91f9e

mgw: mdcx: Fix inc of non-existing ctr in mdcx counter group

Change-Id: If849e3922c7ae864771c41ff7c0fac37ef0280de