allow 'systemctl enable' and ensure start after local and remote fs

[aflyhorse]

Current service file missing [Install] section, causing:

# systemctl enable robinhood.service
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).
This means they are not meant to be enabled using systemctl.

Also, add dependency to ensure robinhood start after local and remote fs