cert: use unique serial number for server certificates

[rogpeppe]

Browsers complain if you don't.

(Review request: http://reviews.vapour.ws/r/5538/)

[rogpeppe]

[rogpeppe]

$$merge$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju

[jujubot]

Build failed: Tests failed
build url: http://juju-ci.vapour.ws:8080/job/github-merge-juju/8952

[rogpeppe]

$$merge$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju

[jujubot]

Build failed: Tests failed
build url: http://juju-ci.vapour.ws:8080/job/github-merge-juju/8975

[bz2]

The inital run failed due to a mistake in the job when looking for the tarball, which has now been fixed:
[Errno 2] No such file or directory: 'ci/juju-core_2.0-beta17.tar.gz'

The latest one failed on feature tests not being able to connect to the api:
[LOG] 0:00.351 ERROR juju.worker.dependency "api-caller" manifold worker returned unexpected error: cannot open api: unable to connect to API: websocket.Dial wss://localhost:48632/model/deadbeef-0bad-400d-8000-4b1d0d06f00d/api: dial tcp 127.0.0.1:48632: getsockopt: connection refused

[rogpeppe]

$$merge$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju

[jujubot]

Build failed: Tests failed
build url: http://juju-ci.vapour.ws:8080/job/github-merge-juju/8977

[rogpeppe]

$$merge$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju

[jujubot]

Build failed: Tests failed
build url: http://juju-ci.vapour.ws:8080/job/github-merge-juju/8983

[rogpeppe]

$$merge$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju