more volumes shorthand

[ublubu]

94 #77

builds on #106

@wlan0

Still in progress: config-map, secret, downward-api, git, projected, persistent volumes

[ublubu]

updated, @wlan0 switched vol_name to vol_id for azure_disk, moved vol_id to disk_name for glusterfs, moved path to vol_id, moved vol_id to endpoints. (both fields are required) according to the docs, path is the volume id, so it makes more sense this way.

[wlan0]

Thanks, LGTM