webadmin,userportal: can't open permissions dialog

Moving driver initialization to PermissionsPopupView
sub-classes (when invoked from the super-class,
the driver field of the sub-class has not yet initialized).
[changed in: I73ba1fa29629538d6160fa042113859a6bf1ae7f]

Change-Id: I2cc469cf1845982eff5a98ca1547c204ec3b87e1
Signed-off-by: Daniel Erez <derez@redhat.com>