Set default branch for git review/gerrit.

Switch amulet tests to stable.

Switch to using stable charm-helpers branch.

Change-Id: I717a23bc9321a0ef843588a459eeed5719d1854e

Change-Id: Ic6469d4af7edd755c22d4e31b87d9a36937d3134

Make default func27-smoke xenial-pike
Charm-helpers sync

Change-Id: I289d38e4170d204fbf9b0281b28be28c9e847e65

There was a race where the https apache2 site,
openstack_https_frontend.conf, would be rendered in one hook, then
subsequently the config-changed hook would run and enable that site.
However, the subsequent config-changed hook would see the template as
having not changed and therefore it would fail to restart apache2.
This lead to apache2 failing to listen on the correct ports.

This was due to CONFIGS.write_all() being called but a2ensite not
being called. This change fixes this race and adds a call to
configure_https() to ensure the configuration completes and apache2
is restarted.

Change-Id: I229d25c707a0630c9d609fd20a962a0de2e42c77
Closes-Bug: #1723892

ssl_ca is not necessary when ssl_cert is signed by
a trusted CA, such as GeoTrust, because a trusted
cert chain is in the system already. Users can just
provide ssl_cert and ssl_key to enable SSL endpoint
in that case.

Closes-Bug: #1711354
Change-Id: I4a34df1a2c2bf5705e02b713d968a22f4bbf57cf