Multiple fixes

• Enable Docker privileged mode at runner registration if desired
• Fix multi-line string for runner registration command
• Prepend each docker volume entry with --docker-volumes

Added s3 support

Added s3 support

Add limit option for specific runner

Add limit option for specific runner

Fix registration check when in Ansible check-mode

As the title: Fix registration check when in Ansible check-mode

Fix concurrency auto-detection

Auto-detect runner concurrency based on total CPU threads (vcpus), instead of only processor cores. This accounts for both multiple cores and multiple processors.

For example, some virtual machines will detect as having multiple discrete processors (1 core each) instead of one processor with multiple cores. And some physical servers have 2 (or more) processor sockets.

Updated with latest pull request

• Remove ssh variable requirement
• set docker-volumes correctly for 10.x
• add locked variable
• updated for gitlab 10.x

Added docker privileged option & restart notify

Added docker privileged option & restart notify, thanks @romaincabassot