sysrc: Be quiet when changing values

[jlduran_gmail.com]

Summary

Currently the behavior is the same with or without the quiet (-q) flag:

Before:

# sysrc -q hostname=foo
hostname:  -> foo

After:

# sysrc -q hostname=foo

Test Plan

Not much fuzz about this change, just to avoid redirecting the output.

[jlduran_gmail.com]

Some bogus file creeped in. I apologize.

[jlduran_gmail.com]

I see a resemblance with sysctl here, and I would not want to change that.

If sysctl also had a "really be quiet" option (let's say -Q or -qq), then sysrc should mimic that.

Thoughts?

EDIT: (cross-reference: there is no shame in redirecting)