Fix compilation of bsnmp tests.PR: 277539Submitted by: John F. Carr
Remove residual blank line at start of MakefileThis is a residual of the $FreeBSD$ removal.MFC After: 3 days (though I'll just run the command on the branches)Sponsored by: Netflix
Remove $FreeBSD$: one-line sh patternRemove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
Add a makefile to build and run the tests for the bsnmp library.This is not automatically built or run but must explicitly be builtwith 'make' and run with 'make run'.