ipa: Introduce support for user-specific DSCP and priority

This adds new members to struct ipa_server_link and ipa_client_conn,
which can be set by the user before ipa_client_conn_open() or
ipa_server_link_open() to ensure DSCP / priority values are applied
from the first outgoing packet onwards.

Change-Id: I5ab22d35d9b11eca47d9ea12208e5589a1a5713c
Depends: libosmocore.git If22988735fe05e51226c6b091a5348dcf1208cdf
diff --git a/TODO-RELEASE b/TODO-RELEASE
index d0852fc..8c417cd 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,6 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what		description / commit summary line
+update libosmocore dependency to > 1.5.1 for OSMO_SOCK_F_{DSCP,PRIO}()
+libosmo-abis	new member	ipa_client_conn new struct members dscp, priority
+libosmo-abis	new member	ipa_server_link new struct members dscp, priority