selftests: net: add in_netns.sh to TEST_PROGS

Script in_netns.sh isn't installed.
--------------------
running psock_fanout test
--------------------
./run_afpackettests: line 12: ./in_netns.sh: No such file or directory
[FAIL]
--------------------
running psock_tpacket test
--------------------
./run_afpackettests: line 22: ./in_netns.sh: No such file or directory
[FAIL]

In current code added in_netns.sh to be installed.

Fixes: cc30c93f ("selftests/net: ignore background traffic in psock_fanout")
Signed-off-by: NAnders Roxell <anders.roxell@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/Makefile

@@ -5,7 +5,7 @@ CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g
 CFLAGS += -I../../../../usr/include/
 
 TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh rtnetlink.sh
-TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh
+TEST_PROGS += fib_tests.sh fib-onlink-tests.sh in_netns.sh pmtu.sh
 TEST_GEN_FILES =  socket
 TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy
 TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa