* Store version-check file in the configured data-directory
This also fixes what I think is a bug.
It also un-exports everything.
I have questions.
* Version checking: clean up code, add server flags
FB-1975
Cleaned up version checking, removed a race condition, and added error checking.
Added server flags for check-in endpoint and UUID storage file.
Incorporates Travis's changes to store UUID file in data directory
and unexport most of verchk.go.
---------
Co-authored-by: Travis Turner <travis@molecula.com>
Co-authored-by: seebs <seebs@molecula.com>
stdout/stderr around
A lot of functions in the cmd and ctl packages were passing these
around and barely using them. Replaced them with a logger for most
functions. Some functions get an io.Writer instead so that their
tests can find the output they're looking for.
More cleanup on fb-1766: reworked the tests that were using io.Pipe
or os.Pipe to check their results so they now use a bytes.Buffer.
Unexported some variables that didn't need to be exported.
Fixed NewConfigCommand to use the provided stderr, not os.Stderr.
Added tests for rbf_dump, rbf_page, and keygen, since those weren't
being tested at all.
Added chksum_test, final cleanup.
(cherry picked from commit f627199acb)
