Merging upstream branch-2.15 [RH git: e478bef7a4]

Merging upstream branch-2.15 [RH git: 87783c67a6]

Merging upstream branch-2.15 [RH git: ed4cf202b5]
util: Fix tunnel key attr for GTP-U.
idl: Only process successful txn in ovsdb_idl_loop_run.

Merging upstream branch-2.15 [RH git: ffd65899bd]
dpif-upcall: Fix n_revalidators on upcall show.

Merging upstream branch-2.15 [RH git: df7561a258]
idl: ovsdb_idl_loop_destroy must also destroy the committing txn.
cs: Clear last_id on reconnect if condition changes in-flight.
flow: Skip flow reply if it exceeds the maximum message size.
cs: Fix ignoring of the last id from the initial monitor reply. (#2044624)

Merging upstream branch-2.15 [RH git: 0ec5c70e5a]
dpif: Fix issue with non-reversible actions on a patch ports.

downstream: Enable usdt probes in build [RH git: 3e2ddcc2da]

utilities: Add netlink flow operation USDT probes and upcall_cost script. [RH git: 1ef4073913]
off-by: Eelco Chaudron <echaudro@redhat.com>
by: Paolo Valerio <pvalerio@redhat.com>
off-by: Ilya Maximets <i.maximets@ovn.org>

utilities: Add upcall USDT probe and associated script. [RH git: f581b3a82c]
vswitchd. By default, it will
system 0 98 132
system 0 70 160
system 0 98 152
off-by: Eelco Chaudron <echaudro@redhat.com>
by: Paolo Valerio <pvalerio@redhat.com>
off-by: Ilya Maximets <i.maximets@ovn.org>

Documentation: Add USDT documentation and bpftrace example. [RH git: 2a54ac2f9f]
off-by: Eelco Chaudron <echaudro@redhat.com>
by: Paolo Valerio <pvalerio@redhat.com>
off-by: Ilya Maximets <i.maximets@ovn.org>

openvswitch: Define the OVS_STATIC_TRACE() macro. [RH git: fa1e850486]
off-by: Eelco Chaudron <echaudro@redhat.com>
by: Paolo Valerio <pvalerio@redhat.com>
off-by: Ilya Maximets <i.maximets@ovn.org>

configure: Add --enable-usdt-probes option to enable USDT probes. [RH git: e1e982a7c1]
-enable-usdt-probes option to the
off-by: Eelco Chaudron <echaudro@redhat.com>
by: Paolo Valerio <pvalerio@redhat.com>
off-by: Ilya Maximets <i.maximets@ovn.org>

Merging upstream branch-2.15 [RH git: a70244a272]
monitor-ipsec: Fix generated strongSwan ipsec.conf for IPv6.

Merging upstream branch-2.15 [RH git: d17382a24e]
windows: Pickup Ct tuple as CT lookup key in function OvsCtSetupLookupCtx

Merging upstream branch-2.15 [RH git: 14826e19b9]

Merging upstream branch-2.15 [RH git: 228a38c3dc]
dpif: Fix memory leak in dpif/show-dp-features appctl.