use istioRev to manage cr's reconcile instead of istioRev and configRev

[MouceL]

1. istioRev: determines the scope of management

usage

If a is set, then whatever b is

if istioRev is empty, then whatever strictRev is true or false, slime will manage the all cr

global:
  istioRev: ""

if strictRev is true, slime will only manage the cr with labels istio.io/rev: istio-17 or istio.io/rev: istio-112

global:
  istioRev: istio-17,istio-112
  strictRev: true

if strictRev is false, slime will manage the cr with label istio.io/rev: istio-17 or istio.io/rev: istio-112 or cr without rev label

global:
  istioRev: istio-17,istio-112
  strictRev: false

if strictRev is false and istioRev is empty, slime will manage the all cr

global:
  strictRev: false

2. slime will retrive config via configRev instead of istioRev+configRev