docs: Self signed certificate fails on Ubuntu 16.04

[harshavardhana]

https://github.com/minio/minio/tree/master/docs/tls#with-openssl

Expected Behavior

Certificates are generated properly

Current Behavior

$ openssl genrsa -out private.key 2048
Generating RSA private key, 2048 bit long modulus
...................+++
......+++
e is 65537 (0x10001)

$ openssl req -new -x509 -days 3650 -key private.key -out public.crt -subj "/C=country/ST=state/L=location/O=organization/CN=domain"
problems making Certificate Request
140255692420760:error:0D07A097:asn1 encoding routines:ASN1_mbstring_ncopy:string too long:a_mbstr.c:158:maxsize=2

Possible Solution

Country name should be

$ openssl req -new -x509 -days 3650 -key private.key -out public.crt -subj "/C=US/ST=state/L=location/O=organization/CN=domain"

Steps to Reproduce (for bugs)

Just follow the referred document link.

Context

To be able to configure SSL

Your Environment

All versions.

[koolhead17]

This can be closed via #3957

[harshavardhana]

Fixed by #3957

[lock]

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