MFC r299844,r300931:

r299844:

Make hostid_save depend on hostid

r300931:

Make netif REQUIRE hostid

As noted in the PR, if etc/rc.d/zvol is removed, netif will be run before
hostid, and the MAC address generated for any bridge devices will be
non-deterministic. Make the MAC address generated be deterministic for
bridge devices by explicitly REQUIRE'ing hostid.

This fixes up the rest of the PR, inadvertently committed in r299844

PR: 195188

MFC 287613:

Update only static routes when an interface is specified. This fixed
a bad side-effect reported in PR 202144.

PR: 202144

MFC 287613:

Update only static routes when an interface is specified. This fixed
a bad side-effect reported in PR 202144.

PR: 202144