MT#59962 AmSdp: print DTLS `fingerprint` & `setup`

When parsing SDP and not being in the path
of the media stream, `fingerprint` and `setup`
aren't considered as generic attributes and
are parsed into the dedicated SdpMedia fields.

So when preparing SDP to be printed and
to be sent out, take them also into account.

(Looks like was missed when reworking stuff
last time around media processing)

Change-Id: I48437d3587321a04395b70823207292590ea6523

core/AmSdp.cpp

@@ -656,6 +656,13 @@ void AmSdp::print(string& body) const
 	out_buf += a_it->print();
       }
 
+      // add DTLS attributes
+      if (!media_it->dtls_role.empty())
+        out_buf += "a=setup:" + media_it->dtls_role + "\r\n";
+      if (!media_it->dtls_hash.empty() && !media_it->dtls_fingerprint.empty())
+        out_buf += "a=fingerprint:" + media_it->dtls_hash + " " +
+          media_it->dtls_fingerprint + "\r\n";
+
       // add ICE credentials
       if (!media_it->ice_username.empty() && !media_it->ice_password.empty()) {
         out_buf += "a=ice-ufrag:" + media_it->ice_username + "\r\n";
@@ -2046,4 +2053,3 @@ static bool attr_check(std::string attr)
     return false;
   }
 }
-