This value is needed for Minio's internode communication, read the meaning of this value as per the HTTP 2.0 spec https://http2.github.io/http2-spec/#rfc.section.5.1.2
The test TestServerTLSCiphers seems to fail sometimes for no obvious reason. Actually the test is not needed (as unit test) since minio/mint tests the server's TLS ciphers as part of its security tests. Fixes #5977