write builtin config on any global npm install

This is literally how it's always *supposed* to have been working.  Yet,
mysteriously, it has not been.
use common.npm instead of npm.install()

Also fixes the console output during test.
updated to use common.npm() and got rid of console pollution
use common.npm(), fix console pollution
use common.npm(), fix console pollution
use common.npm instead of spawn
convert from spawn to common.npm

In the process, followed failing code path to command that wasn't
respecting the loglevel.
git needs GIT_SSL_CAINFO

This was being filtered needlessly.