Cu ccwww0 login logout doctor backend ap is 2

[sjathin]

1. Add doctor role as attr, as adding role give access denied to the channel.
2. initRedis to add admins to redis.
3. Login and logout for doctor and admin.
4. Creates a session on login. And destroy on logout.
5. Connect to network using session username.

[kshitijyelpale]

Task linked: CU-ccwww0 Login/Logout Doctor Backend APIs

[sjathin]

1. Remove session and username to be passed in the header
2. jwt uses a secret token instead of the user password
3. Logout to be handled in frontend