net: Remove legacy tests from runtest

Remove all network stress tests which haven't been rewritten to the new
API yet from the runtest file (mostly multicast tests + some route tests).
These tests use check_envval and other deprecated tools.

See also:
#310
#440

Suggested-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Acked-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: Petr Vorel <pvorel@suse.cz>

runtest/net_stress.multicast

@@ -6,24 +6,8 @@ mcast4-group-single-socket mcast-group-single-socket
 mcast4-group-multiple-socket mcast-group-multiple-socket
 mcast4-group-same-group mcast-group-same-group
 mcast4-group-source-filter mcast-group-source-filter
-mcast4-pktfld01 mcast4-pktfld01
-mcast4-pktfld02 mcast4-pktfld02
-mcast4-queryfld01 mcast4-queryfld01
-mcast4-queryfld02 mcast4-queryfld02
-mcast4-queryfld03 mcast4-queryfld03
-mcast4-queryfld04 mcast4-queryfld04
-mcast4-queryfld05 mcast4-queryfld05
-mcast4-queryfld06 mcast4-queryfld06
 
 mcast6-group-single-socket mcast-group-single-socket -6
 mcast6-group-multiple-socket mcast-group-multiple-socket -6
 mcast6-group-same-group mcast-group-same-group -6
 mcast6-group-source-filter mcast-group-source-filter -6
-mcast6-pktfld01 mcast6-pktfld01
-mcast6-pktfld02 mcast6-pktfld02
-mcast6-queryfld01 mcast6-queryfld01
-mcast6-queryfld02 mcast6-queryfld02
-mcast6-queryfld03 mcast6-queryfld03
-mcast6-queryfld04 mcast6-queryfld04
-mcast6-queryfld05 mcast6-queryfld05
-mcast6-queryfld06 mcast6-queryfld06

runtest/net_stress.route

@@ -5,14 +5,10 @@ route4-change-if route-change-if.sh
 route4-change-netlink-dst route-change-netlink-dst.sh
 route4-change-netlink-gw route-change-netlink-gw.sh
 route4-change-netlink-if route-change-netlink-if.sh
-route4-redirect route4-redirect
-route4-rmmod route4-rmmod
 
 route6-change-dst route-change-dst.sh -6
 route6-change-gw route-change-gw.sh -6
 route6-change-if route-change-if.sh -6
 route6-change-netlink-dst route-change-netlink-dst.sh -6
 route6-change-netlink-gw route-change-netlink-gw.sh -6
 route6-change-netlink-if route-change-netlink-if.sh -6
-route6-redirect route6-redirect
-route6-rmmod route6-rmmod