Upgrade Fog to version 1.27.0 and above
Upgrade Fog to version 1.27.0 and above

Upgrade Fog to version 1.27.0 to keep it in sync with the version of Fog
Core we are explicitly requiring.

We're explicitly specifying the version of Fog Core so that we can
ensure we're using version 1.27.4 and above:

https://github.com/fog/fog-core/commit/58556e4b1e65d2ac8dd177c531dd8a23929d39e3

Also, use pessimistic versioning (AKA the [twiddle-wakka][]) to ensure
that we don't inadvertently start using Fog version 2.0, which may
introduce backwards-incompatible changes according to the definition of
[semantic versionining][].

[twiddle-wakka]: http://robots.thoughtbot.com/rubys-pessimistic-operator
[semantic versioning]: http://semver.org/

gds-operations/vcloud-core,gds-operations/vcloud-core