[keycloak-dev] Default admin password

[Marek Posolda]

Currently there are many things for initialization of master realm 
hardcoded in ApplianceBootstrap including the initial password of admin 
user. Maybe it's not so big issue as user is required to change admin 
password after first login, but still it's not ideal IMO because if 
someone access admin console faster than you, he can change admin 
password and gain full admin access.

I wonder if we can improve this? At least adding initial admin password 
into keycloak-server.json may help a bit as people can change default 
value from "admin" to something else. wdyt?

Marek