SMS media plugin should have a configuration option for message prefixes

[lunkwill42]

Is your proposal related to a problem?

Some users have an SMS dispatcher service where all messages come from the same number, regardless of the message's origin (this includes Sikt and SUNET). It is not always clear whether any given SMS came from Argus or from some other service.

Desired solution

The SMS media plugin should have an optional setting to add some prefix to all sent messages, e.g. Argus:, so that users in situation describe above can easily distinguish which service sent a particular notification.