The integration tests run by devcam test require a
GPG keyblob in the default location (for camput), and
we do not track in git such a keyblob.
This change allows devcam test to create the keyblob
with devcam put init before running the tests.
Also, devcam server is now using CAMLI_KEYID instead
of hardcoding the key id in the dev server config file.
Change-Id: I030b88c9a9321016fedb62424e0e707621206922