Merge pull request #10231 from miri64/gnrc_ipv6_ext/enh/move-rh-to-gnrc

Makefile.dep

sys/Makefile

sys/include/net/gnrc/ipv6/ext.h

sys/include/net/gnrc/ipv6/ext/rh.h

sys/include/net/gnrc/rpl/srh.h

sys/include/net/ipv6/ext/rh.h

sys/net/gnrc/Makefile

sys/net/gnrc/network_layer/ipv6/ext/gnrc_ipv6_ext.c

sys/net/gnrc/network_layer/ipv6/ext/rh/Makefile

sys/net/gnrc/network_layer/ipv6/ext/rh/gnrc_ipv6_ext_rh.c

sys/net/gnrc/routing/rpl/srh/gnrc_rpl_srh.c

sys/net/network_layer/ipv6/ext/rh/Makefile

tests/unittests/tests-rpl_srh/tests-rpl_srh.c