Improve extend volume form

Add the current volume size to the extend volume form

Remove the progress bar when the volume status is error_extending

Change the success message to an info message when the extending
is in progress

Change-Id: Ic6bd00af393d1f74b2db1a9114b848aa5fe4bbc7
Closes-Bug: #1290544
Closes-Bug: #1318723
Merge "Improve extend volume form"