admin.py: update

Update ip_address field name

Signed-off-by: Václav Ehrlich <vehrlich@redhat.com>
get_server_data.py: Update field name

Update ip_address field name

Signed-off-by: Václav Ehrlich <vehrlich@redhat.com>
models.py: updated data post

IP address field rename, almost finished data posting. Used new way of
request preparing with Requests lib. To install request just sudo pip
requests.

Signed-off-by: Václav Ehrlich <vehrlich@redhat.com>
account.py: Add save_model method

Add save_object method which handle HTTP error codes from server and
show message to user

Signed-off-by: Václav Ehrlich <vehrlich@redhat.com>
models.py: Update

Add return code for save method

Signed-off-by: Václav Ehrlich <vehrlich@redhat.com>