Added a modal dialog with the user credentials details

The modal contains all the credentials used to access the user's
openstack and EC2 instance.

Change-Id: I750b2922a34dd06b2098eff95d817c852a18be07
Implements: blueprint api-access-page-enhancements
Co-Authored-By: Cédric Soulas <cedric.soulas@cloudwatt.com>
Add unit conversion for metering views

Until now, the charts displayed by the metering views (Admin -> Resource
Usage) were using units as defined by the Ceilometer meters. This means
that the values in the charts were sometimes very hard to read for
humans (typically we would see a large number in nanoseconds, bytes,
etc).

This patch introduces support for normalization of these values. The
statistics returned by the Ceilometer API are analyzed to determine
the appropriate unit for the series. The whole series is then
converted to this unit, so that the values in the series are more
easily parsed by humans.

Implements blueprint: ceilometer-api-statistics-decorators-and-convertors
Change-Id: Ia183ca5270ebd1dcbd1fe6ac20ed4dfe4d6ebcc4
Merge "Added a modal dialog with the user credentials details"
Merge "Add unit conversion for metering views"
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: Ia5990fa4587bb1ab1eab715764d33a1c9cd7108e
Merge branch 'master' of https://github.com/openstack/horizon