bootstrap: Added configurable timeout and delays

bootstrap: Added configurable timeout and delays

Fixed bug #1257649: ssh timeout for bootstrap
could be configurable, by adding 3 new config
settings:
- bootstrap-timeout (default: 600s = 10m)
- bootstrap-retry-delay (default: 5s)
- bootstrap-addresses-delay (default: 10s) 

All of them are integers, measured in seconds,
and also all of them are optional and have the
specified defaults.

Updated the bootstrap command's help text to
include the new config settings.

https://code.launchpad.net/~dimitern/juju-core/270-lp-1257649-ssh-timeout-bootstrap/+merge/203832

Requires: https://code.launchpad.net/~dimitern/juju-core/260-lp-1067979-duplicate-charm/+merge/203291

(do not edit description out of merge proposal)

[dimitern, 2014-01-29 20:02:19]

Please take a look.

[natefinch, 2014-01-29 20:10:49]

Please remove all user-facing mentions of SSH, since that's an internal detail
and something that would just confuse users.  This is just a bootstrap timeout
to an end user, even if it does use SSH behind the scenes.

https://codereview.appspot.com/58170045/diff/1/cmd/juju/bootstrap.go
File cmd/juju/bootstrap.go (right):

https://codereview.appspot.com/58170045/diff/1/cmd/juju/bootstrap.go#newcode48
cmd/juju/bootstrap.go:48: bootstrap-ssh-timeout: 600 # default: 10 minutes
ssh is an internal detail that will just be confusing to users.  This is just
the "bootstrap-timeout" to an end user.
 Same goes for retry delay and addresses delay.

[natefinch, 2014-01-29 20:11:09]

Oh yeah, otherwise LGTM :)

[dimitern, 2014-01-29 21:08:29]

Please take a look.

[dimitern, 2014-01-30 14:18:16]

Please take a look.

[dimitern, 2014-01-30 17:29:15]

Please take a look.