cherry-pick:
backport nhrpd support multicast
backport ospf updates

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

The crude loop I wrote to come up with this changeset:

  find -L package/feeds/packages/ -name patches | \
  sed 's/patches$/refresh/' | sort | xargs make

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>

switch to codeload for latest patches applied to stable branch

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

add mips fix missed on version upgrade

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

changelogs: https://github.com/FRRouting/frr/releases/tag/frr-7.4

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

fix mips runtime by backporting some yang changes from master
added commited fixes to 7.3
also add option for snmp support

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

and some backports in fixing ramips target

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

add support to build against OpenSSL

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

in place replacement for quagga

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>