Device Size field now pre-fills with appropriate value

The Device Size field in the Create Instance workflow will now pre-fill
with a value equal to the largest of either the min_disk value of the
selected image or the total_disk value of the selected flavor - provided
that the larger value is >= 1.

Change-Id: I2f9cb3e956fe374609503b8c955f98a4efe3a456
Closes-Bug: 1328911
Fixes double evaluation of AngularJS in modal box

AngularJS syntax is evaluated twice in modal box after submitting form
which succeed and no redirection is going to be made. This commit fixes
this bevahiour by executing AngularJS code just after modal is created
and not every time it is going to be shown.

Change-Id: I204fce23ce52f74c38b7dc40ef03c6d5710ad254
Closes-Bug: #1371116
Merge "Device Size field now pre-fills with appropriate value"
Merge "Fixes double evaluation of AngularJS in modal box"
Merge branch 'master' of https://github.com/openstack/horizon