Since each of these tests only applies to testing networks, put them
all into a single block that checks for testing networks.

(I recommend reviewing with the "diff -b" option, since the change
is mostly indentation.)

It can just look at what the defaults are.

Closes ticket 32185.

This pleases practracker.

Two things needed to be changed.  First, we used to set quiet_level
to the default (QUIET_NONE) when running tests, since we would not
call anything that acted based upon it.  But since we sometimes call
options_init_logs(), we need to pre-set quiet_level to QUIET_SILENT
in the logs so that we don't add the default logs.  This did not
cause test failure: just unwanted logs.

Second, we had a test that checked whether options_validate was
messing with options->Logs correctly.  Since options_validate no
longer messes with the logs, we no longer want a test for this.

Formerly, we would use quiet_level as an excuse to rewrite the log
configuration, adding a default log line if none existed, and if
RunAsDaemon was not set, and if we were not being invoked via
setconf (!).

This is against our best practices for several reasons:
  * We should not be changing configured options except when the
    user tells us to do so.
  * We should especially not be changing options in the options_validate
    function.
  * Distinguishing whether we are being called from setconf adds a
    risky special-case.

Instead, this patch take a simpler approach: it changes the
interpretation of having no logging lines set to mean: If there is a
stdout, add a default log based on quiet_level.

Solves ticket 31999.