[1.0.0.rc1] add label manpage and fix help#190

mrunalp merged 1 commit intoopencontainers:v1.0.0.rc1opencontainers/runtime-tools:v1.0.0.rc1from

wking:man-add-label-and-fix-helpwking/ocitools-v2:man-add-label-and-fix-helpCopy head branch name to clipboard