getAllDoctors and adding attributes to user

[sjathin]

User attributes can be added and enrolled.

• While registering doctor the body must look like:

  {
  "hospitalId": 1,
  "role": "doctor",
  "userId": "HOSP001-DOC004",
  "firstName": "DoctorName",
  "lastName": "LastName"
  }

• For registering patient the body must look like

  {
  "hospitalId": 2,
  "role": "patient",
  "userId":"HOSP002-PAT003",
  ...
  }

• The output for /doctors/:hospitalId/_all :

  [
  {
      "id": "HOSP001-DOC004",
      "role": "doctor",
      "firstName": "DoctorName",
      "lastName": "LastName"
  }
  ]

[kshitijyelpale]

Task linked: CU-d54c0c Get all doctors filtered by hosp