Different Pop-up Windows for Warnings

[LeoNerdoG]

There are several different pop-ups for Warnings, some are light yellow, some are red - I suggest this gets unified (see screenshots bellow).

Testflow No. 1:

1. Login to Kura as admin/admin
2. Go to Firewall service
3. Try to create a duplicate entry (try to open a port that is already opened) - Screenshot No. 1

Testflow No. 2:

1. Login to Kura as admin/admin
2. Go to Network
3. Try to set two network interfaces as WAN - Screenshot No. 2

Testflow No. 3:

1. Login to Kura as admin/admin
2. Go to Cloud Connections
3. Try to create a publisher with the same name as one of the cloud connection has (e.g. org.eclipse.kura.cloud.CloudService) - Screenshot No. 3

Testflow No. 4:

1. Login to Kura as admin/admin
2. Go to Drivers and Assets
3. Try to create a driver without specifying a factory - Screenshot No. 4

Expected behavior Warning pop-ups should have the same form.

Screenshot No. 1 (Warning when creating duplicate entry in Firewall service):

Screenshot No. 2 (Warning when trying to set two interfaces as WAN in Network service):

Screenshot No. 3 (Warning when trying to create a publisher with non-unique service PID)

Screenshot No. 4 (When trying to create a driver without selecting a factory):

Target Environment (please complete the following information): Board: Raspberry Pi 3 OS version: Linux raspberrypi 4.19.75-v7+ # 1270 SMP Tue Sep 24 18:45:11 BST 2019 armv7l GNU/Linux Additional info: /