libct/StartInitialization: fix errors
libct/StartInitialization: fix errors

Errors from strconv.Atoi are already descriptive enough, and contain the
value being converted, so our error messages do not need to contain it.

While at it, use %w to wrap errors.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

dqminh/runc,rhatdan/runc,opencontainers/runc,kolyshkin/runc,rhatdan/runc,dqminh/runc,dqminh/runc,kolyshkin/runc,opencontainers/runc,opencontainers/runc,rhatdan/runc,rhatdan/runc,opencontainers/runc,dqminh/runc,kolyshkin/runc,kolyshkin/runc