Make icalendar-import-buffer not show diary file buffer

* lisp/calendar/diary-lib.el (diary-make-entry): Add
omit-trailing-space parameter.  Add do-not-show parameter to
allow not showing diary file buffer.
* lisp/calendar/icalendar.el (icalendar--add-diary-entry): Remove
workaround to omit trailing space in diary entry.  Have
diary-make-entry not display the diary file buffer.  (Bug#35645)
1 job for master in 3 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #2040
test-all

00:00:03

 
Name Stage Failure
failed
test-all Test There has been a runner system failure, please try again
Running with gitlab-runner 11.6.0 (f100a208)
on gitlab-runner-docker cff9d373
Using Docker executor with image debian:stretch ...
Pulling docker image debian:stretch ...
Using docker image sha256:8d31923452f8b79ae91b01568d28c90e7d667a9eaff9734c6faeb017b0efa8d0 for debian:stretch ...
ERROR: Job failed (system failure): Error response from daemon: failed to start shim: exec: "docker-containerd-shim": executable file not found in $PATH: unknown (executor_docker.go:1018:0s)