BLUE-BAR: handle changes suggested by the participants

[chibenwa]

Description

Given Anne Sophie suggest changes to Benoit Event
And Benoit Opens the suggested changes
When Accepting Anne sophie proposal
Then the meeting is updated

Actual behavious

The event is rejected as we miss the REQUEST method

Expected behviour

(hoping that accepting the ICS and forwarding it to OpenPaaS is enough)

Accepting METHOD:COUNTER for CalendarEvent/accept ?

Related materials

meeting.ics.txt

mail.eml.txt

Definition of done

VERIFY FIRST THAT ACCEPTING the ICS is ENOUGH - Rogue deploy of a patched image onto imap.linagora.com to this end is acceptable: Receive a counter, accept it, and see if the event is correctly updated....

Then simply commit the changes and open a PR... (no integration test needed for cross product integration with OpenPaaS).