NFS and SMB mounts configuration refactoring
NFS and SMB mounts configuration refactoring

- Moved NFS export creation from docker_machine_mount_nfs into a separate function - nfs_share_add
- Renamed docker_machine_remove_nfs => nfs_share_remove
- Renamed docker_machine_remove_smb => smb_share_remove
- Replaced docker_machine_mounts with configure_mounts
- Added configure_mounts on/off to system start/stop functions respectively

docksal/docksal