This commit introduces test cases for testing
CopyFile API using kata-agent-ctl with improved command
semantics and handling.
- copy a file to /run/kata-containers
- copy symlink to /run/kata-containers
- copy directory to /run/kata-containers
- copy file to /tmp
- copy large file to /run/kata-containers
Signed-off-by: Sumedh Alok Sharma <sumsharma@microsoft.com>