cmd/jujud: don't redirect bootstrap-state logs

Redirecting bootstrap logs breaks bootstrap error reporting.

Fixes https://bugs.launchpad.net/juju-core/+bug/1366650
cmd/jujud: log stack trace on panic
Merge pull request #698 from axw/lp1366650-bootstrap-no-log-redirection

cmd/jujud: don't redirect bootstrap-state logs

Redirecting bootstrap logs breaks bootstrap error reporting.

Fixes https://bugs.launchpad.net/juju-core/+bug/1366650