The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
* added lockedfileapi support for CNI
* fixed interface changes
* addressed comments
fixed ut
* addressed comments
* fixed copy to buffer part in writer api
* fixed copy to buffer part in writer api
* keeping old code not changing it.