All contributions to this charm where made under Canonical
copyright; switch to Apache-2.0 license as agreed so we
can move forward with official project status.

In order to make this change, this commit also drops the
inclusion of upstart configurations for very early versions
of Ceph (argonaut), as they are no longer required.

Change-Id: I9609dd79855b545a2c5adc12b7ac573c6f246d48