template: oci template supports for char user info
template: oci template supports for char user info

oci template changes character user info to uid, gid
according to OCI image spec.

Signed-off-by: 1d56755e3eb264f1ae0e3caf16781ed0b91b89d1@tmax.co.kr

ss1h2a3tw/lxc,hallyn/lxc,caglar10ur/lxc,ss1h2a3tw/lxc,hallyn/lxc,caglar10ur/lxc,caglar10ur/lxc,ss1h2a3tw/lxc,hallyn/lxc