Allow optional prefix for AuthNRequest ID attribute

[gowda]

ID attribute is returned as InResponseTo attribute of the response by servers (as mentioned by Azure documentation).

[pitbulk]

It makes more sense to add the prefix to the uuid method ot the Utils, rather than in only the request constructor.

You can add a constant to the Utils class by default "_" (the current prefix) so then later the user will be able to override it dinamycally

[gowda]

It makes more sense to add the prefix to the uuid method ot the Utils, rather than in only the request constructor.

You can add a constant to the Utils class by default "_" (the current prefix) so then later the user will be able to override it dinamycally

I have update Utils.uuid method to accept an optional prefix which is set to _ by default.

[pitbulk]

I dislike the need of changing code in all the places where uuid is used with the new parameter.

Can you instead follow my suggestion and just add a param to the Util class, by default "_" and then change the uuid in order to use it.

developers that want the new behavior only will need to change the attribute from the Util class and that all.

[pitbulk]

prefix support gonna be included at #633