slapos_web: Improve the display of service list and hosting subscription (short title and description)

For now, it only generate entries for tickets.

List Ticket which are related to the Hosting Subscription and Computers (at web view)
Added a button to open a Ticket from Hosting Subscription and Computers (at web view)
Include RSS link generator (not exactly working yet)

This url allows us build easily a link (url) in order to request an instance from some external website.

this will expose default values which are wrongly inputed.

For now, it only generate entries for tickets.

List Ticket which are related to the Hosting Subscription and Computers (at web view)
Added a button to open a Ticket from Hosting Subscription and Computers (at web view)
Include RSS link generator (not exactly working yet)

This url allows us build easily a link (url) in order to request an instance from some external website.

this will expose default values which are wrongly inputed.

Failover should be render a textarea explaining the error.

This will enable edition of parameter using a JS editor.