Make MinIO check more flexible

What does this Merge Request do?

My version of minio doesn't have the version sub-command or the --version flag so GDK thinks it's not installed. This changes the check so it can awk the version info from the help screen.

Output:

~/Projects/gitlab-development-kit minio                                                                                                                                                                                  ?1 | %0 | . (master) 
NAME:
  minio - High Performance Object Storage
DESCRIPTION:
  Build high performance data infrastructure for machine learning, analytics and application data workloads with MinIO
USAGE:
  minio [FLAGS] COMMAND [ARGS...]
COMMANDS:
  server   start object storage server
  gateway  start object storage gateway
FLAGS:
  --config-dir value, -C value  [DEPRECATED] path to legacy configuration directory (default: "/home/matteeyah/.minio")
  --certs-dir value, -S value   path to certs directory (default: "/home/matteeyah/.minio/certs")
  --quiet                       disable startup information
  --anonymous                   hide sensitive information from logging
  --json                        output server logs and startup information in json format
  --compat                      enable strict S3 compatibility by turning off certain performance optimizations
  --help, -h                    show help
VERSION:
  2019-12-17T23:16:33Z

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• N/A Documentation added/updated, if needed.
• N/A gdk doctor test added, if needed.