MFC r283291: don't use CALLOUT_MPSAFE with callout_init()The main purpose of this MFC is to reduce conflicts for other merges.Parts of the original change have already "trickled down" via individual MFCs.
MFC r263710, r273377, r273378, r273423 and r273455:- De-vnet hash sizes and hash masks.- Fix multiple issues related to arguments passed to SYSCTL macros.Sponsored by: Mellanox Technologies