Make sysctl work for freebsd: freebsd doesn't like spaces around '=' in /etc/sysctl.conf.

This is the error message on FreeBSD without this fix:

msg: Failed to reload sysctl: sysctl: unknown oid 'debug.trace_on_panic ' at line 12: No such file or directory
sysctl: unknown oid 'debug.debugger_on_panic ' at line 13: No such file or directory
sysctl: unknown oid 'vfs.nfsd.server_min_nfsvers ' at line 14: No such file or directory
sysctl: unknown oid 'kern.maxvnodes ' at line 15: No such file or directory
sysctl: unknown oid 'vfs.nfsd.tcphighwater ' at line 16: No such file or directory