Description of problem:
 update provision plan will make secret reference changed

Version-Release number of selected component (if applicable):
  OpenShift Master:v3.9.14 
  ASB version: 1.1.16

How reproducible:
Always

Steps to Reproduce:
1. Install OCP cluster enable asb
2. provision apb serviceclass with multiple plan, like MySQL (APB).
3. check serviceinstance yaml file 
4. change current plan for serviceinstance
5. check serviceinstance yaml file

Actual results:
3. will find parameter secret under secretKeyRef. like this:
  parametersFrom:
    - secretKeyRef:
        key: parameters
        name: rh-mysql-apb-parametersi4ghu
      
5. will find parameter secret under secretKeyRef. like this:
    parametersFrom:
    - secretKeyRef:
        key: parameters
        name: rh-mysql-apbyn9i2
        
This new secret just contains version info and no other parameters like name, password,user etc.

Expected results:
Should contain all useful info for user.

Additional info: