Flow
  Introduce min only when need to introduce for some later versions of Rancher
  Introduce max only when need to deprecate the version for some versions of Rancher
  K8sToRancherVersionData = everything present in data (don't consider min/max - for upgraded clusters)
  K8sVersionsCurrent = []max from major versions of K8sToRancherVersionData (including min/max logic)
  K8sVersionsBad = Versions with curr > max
 
Data v0
K8sToRancherVersionData  min:- v2.3, max:- v2.3
  (rke-tools=v0.1.16)
  v1.11.5-rancher1-1
  v1.11.6-rancher1-1
  v1.11.8-rancher1-1
  v1.11.9-rancher1-1
  1.11.9-rancher1-2
  (all 1.12.x versions)
  1.12.7-rancher1-3
  (all 1.13.x versions)
  1.13.5-rancher1-3
  1.14.1-rancher1-2
 
Rancher v2.3 calls v0
  K8sToRancherVersionData = everything from above
  K8sVersionsCurrent = 1.11.9-rancher1-2, 1.12.7-rancher1-3, 1.13.5-rancher1-3, 1.14.1-rancher1-2
  K8sVersionsBad = None
 
Data v1
  - Introduce 1.15.1-rancher1-1 only for Rancher v2.4
 
v1
K8sToRancherVersionData min:- v2.3, max:- v2.3
  // same as above
  1.15.1-rancher1-1 (rke-tools=v0.1.18)
    min: v2.4
 
Rancher v2.3 calls v1
  K8sToRancherVersionData = everything from above
  K8sVersionsCurrent = 1.11.9-rancher1-2, 1.12.7-rancher1-3, 1.13.5-rancher1-3, 1.14.1-rancher1-2
  K8sVersionsBad = None
 
Rancher v2.4 calls v1
  K8sToRancherVersionData = everything from above
  K8sVersionsCurrent = 1.11.9-rancher1-2, 1.12.7-rancher1-3, 1.13.5-rancher1-3, 1.14.1-rancher1-2, 1.15.1-rancher1-1
  K8sVersionsBad = None
 
Data v2
  - Introduce security patch - 1.14.2-rancher1-1 Also back port security patch to 2.3
  - Introduce security patch - 1.15.2-rancher1-1 Also back port security patch to 2.4
  - Deprecate - 1.11 for new version 2.5
 
Notes
  - Need to deprecate 1.11 for 2.5, so put max = 2.4
  - Introducing 1.14.2-rancher1-1 to 2.3 and 2.4 needs to have rke-tools 0.1.16 because rke inside rancher 2.3 doesn't support rke-tools 0.1.18
  - Now need 1.14.2-rancher1-2 for 2.5, because that has separate rke-tools 0.1.18 and put min = 2.5
  - for 1.15.2-rancher1-1, rke-tools hasn't changed, so can be back ported to 2.4 easily
 
v2
K8sToRancherVersionData
  min:- v2.3, max :- 2.4
   // All v1.11.x versions
  min:- v2.3, max:- v2.5
   (all 1.12.x and 1.13.x versions)
   1.14.1-rancher1-2 rke-tools=v0.1.16
   1.14.2-rancher1-1 rke-tools=v0.1.16
  min:- v2.4
   1.14.2-rancher1-2 rke-tools=v0.1.18
   1.15.1-rancher1-1
   1.15.1-rancher1-2
 
Rancher v2.3 calls v2
  K8sToRancherVersionData = everything from above
  K8sVersionsCurrent = 1.11.9-rancher1-2, 1.12.7-rancher1-3, 1.13.5-rancher1-3, 1.14.2-rancher1-1
  K8sVersionsBad = None
 
Rancher v2.4 calls v2
  K8sToRancherVersionData = everything from above
  K8sVersionsCurrent = 1.11.9-rancher1-2, 1.12.7-rancher1-3, 1.13.5-rancher1-3, 1.14.2-rancher1-2, 1.15.1-rancher1-2
  K8sVersionsBad = None
 
Rancher v2.5 calls v2
  K8sToRancherVersionData = everything from above
  K8sVersionsCurrent = 1.12.7-rancher1-3, 1.13.5-rancher1-3, 1.14.2-rancher1-2, 1.15.1-rancher1-2
  K8sVersionsBad = Major version 1.11, still works for upgraded setups because K8sToRancherVersionData has the values