Fix 1425 NG-RO unable to pin VNF with vim_account config

If vnf vim-accounts has been changed during instantiation,
the binding between new vim-account information and
ns vld is provided through this fix.
Fixing some code format errors

Change-Id: I7f40e14749cae757843ddea8caeb14325aeaf0f2
Signed-off-by: aticig <gulsum.atici@canonical.com>