Append/Remove specific entries from secure variables

[nasastry]

Current working is any update of secure variable completely replaces the previous value. For example, if the KEK currently contains the ESL's X, Y and Z then using secvarctl or writing to the sysfs locations to update the KEK with a new auth file containing the ESL's A and B will set the updated KEK to just contain A and B . So, appending and removing specific entries is currently not supported.
This is the request for feature/enhancement to support append/remove of specific entries from the secure variables.
Thank you.

[nick-child-ibm]

Hey Nageswara, thanks for your patience! I finally got around to implementing half of your request. I will get around to secvarctl remove soon

[nick-child-ibm]

Sorry, forgot to update this. Pull request #23 should have fully implemented the requested features (insert and remove and test cases). Just waiting on review.