Issue 312 making ss cache volumes optional (#342)

* util functions to return names of ss based on version included

Signed-off-by: prabhaker24 <[email protected]>

* update and rollback code added

Signed-off-by: prabhaker24 <[email protected]>

* fixed format fail issue

Signed-off-by: prabhaker24 <[email protected]>

* small fix added

Signed-off-by: prabhaker24 <[email protected]>

* ut's added

Signed-off-by: prabhaker24 <[email protected]>

* made the code more modular and fixed typos

Signed-off-by: prabhaker24 <[email protected]>

* small fix

Signed-off-by: prabhaker24 <[email protected]>

* fixed typo

Signed-off-by: prabhaker24 <[email protected]>

* changed names of some functions

Signed-off-by: prabhaker24 <[email protected]>

* code for handling corner case added as well as switched to using compare versions

Signed-off-by: prabhaker24 <[email protected]>

* canged the util function to use compare version

Signed-off-by: prabhaker24 <[email protected]>

* removed unnecessary comments

Signed-off-by: prabhaker24 <[email protected]>

* changed rollback logic and fixed comments

Signed-off-by: prabhaker24 <[email protected]>

* updated upgrade.go

* removed unnecessary if

Signed-off-by: prabhaker24 <[email protected]>

Co-authored-by: prabhaker24 <[email protected]>