Add "Size" column to Image Table

In the class ImagesTable in "project/images/images/tables.py"
was added the size column after disk_format column.

Used the exist filesizeformat filter for format the value and verbose name.

Closes-Bug: #1300622
Change-Id: I047732bc0295ea50d7ddd88745320c0946471d7c
volume details page does not show source image details

Cinder volume details page is updated to show the image
details if the volume is created from the image.

Change-Id: I5d7a06cb18a39c4a252c58fabf3b7187f337fb44
Closes-bug: #1317041
Introduce safer access to resource meters

Storing of meters in the wrapper object attributes is bad. It
can lead to name conflicts, which can theoretically result
in weird bugs.

Change-Id: I7b1a248be52721b0401fba7bf976b9c4e63f71ba
Implements: blueprint ceilometer-api-enhancements
Merge "Add "Size" column to Image Table"
Merge "Introduce safer access to resource meters"
Merge "volume details page does not show source image details"