selftests/net/forwarding: teamd command not found

Running "make kselftest TARGETS=net/forwarding" results in
multiple ccurrences of the same error:
- ./lib.sh: line 787: teamd: command not found

This patch adds the variable $REQUIRE_TEAMD in every test that uses the
command teamd and checks the $REQUIRE_TEAMD variable in the file "lib.sh"
to skip the test if the command is not installed.

Signed-off-by: Alessandro Zanni <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/drivers/net/mlxsw/rif_bridge.sh

···
 	bridge_rif_remaster_port
 "
 
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=2
 source $lib_dir/lib.sh
 source $lib_dir/devlink_lib.sh

tools/testing/selftests/drivers/net/mlxsw/rif_lag.sh

···
 	lag_rif_nomaster_addr
 "
 
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=2
 source $lib_dir/lib.sh
 source $lib_dir/devlink_lib.sh

tools/testing/selftests/drivers/net/mlxsw/rif_lag_vlan.sh

···
 	lag_rif_nomaster_addr
 "
 
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=2
 source $lib_dir/lib.sh
 source $lib_dir/devlink_lib.sh

tools/testing/selftests/net/forwarding/lib.sh

···
 : "${REQUIRE_JQ:=yes}"
 : "${REQUIRE_MZ:=yes}"
 : "${REQUIRE_MTOOLS:=no}"
+: "${REQUIRE_TEAMD:=no}"
 
 # Whether to override MAC addresses on interfaces participating in the test.
 : "${STABLE_MAC_ADDRS:=no}"
···
 fi
 if [[ "$REQUIRE_MZ" = "yes" ]]; then
 	require_command $MZ
+fi
+if [[ "$REQUIRE_TEAMD" = "yes" ]]; then
+	require_command $TEAMD
 fi
 if [[ "$REQUIRE_MTOOLS" = "yes" ]]; then
 	# https://github.com/troglobit/mtools

tools/testing/selftests/net/forwarding/mirror_gre_bridge_1q_lag.sh

···
 	test_mirror_gretap_second
 "
 
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=6
 source lib.sh
 source mirror_lib.sh

tools/testing/selftests/net/forwarding/mirror_gre_lag_lacp.sh

···
 	test_mirror_gretap_second
 "
 
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=6
 source lib.sh
 source mirror_lib.sh

tools/testing/selftests/net/forwarding/router_bridge_1d_lag.sh

···
 	ping_ipv4
 	ping_ipv6
 "
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=8
 source lib.sh
 

tools/testing/selftests/net/forwarding/router_bridge_lag.sh

···
 	ping_ipv4
 	ping_ipv6
     "}
+REQUIRE_TEAMD="yes"
 NUM_NETIFS=8
 : ${lib_dir:=.}
 source $lib_dir/lib.sh