The goal is to drop slapos.cookbook:erp5.test

No need for a recipe to do a bit of url parsing and generating 2 wrappers.
Also, drop unused & empty "host-common" section.

- stack/erp5: Add path to all binary links in PATH
- stack/erp5: Add single quotation marks to not break parameters in many lines
- stack/erp5: Fix path to avoid one section to overwrite the file from another section
- stack/erp5: pass cloudooo host instead of the IP address. The IP address and cloudooo hostname are well in $SLAPPART/etc/hosts
- stack/erp5: Use use-ipv6 instance parameter to control where caucased listens when locally deployed.
  Drop incomplete 6tunnel usage on balancer toward zopes.

Tests are somehow happy test_result_module/20180626-62AD32BB test_result_module/20180626-70AC16FA

If no objections I would like to merge tomorrow but feel free to press merge for me :)

The goal is rebase nexedi/slapos!318 to fix the conflict and merge after tomorrow.

/cc @rafael @vpelletier 

/reviewed-on nexedi/slapos!347