Add unload code to tramp-integration.el

* lisp/net/tramp-integration.el (info-lookup->mode-cache)
(info-lookup->topic-cache, info-lookup-alist): Declare.
(ido, ivy, info-look): Adapt `tramp-integration-unload-hook'.
1 job for master in 55 minutes and 41 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Test
failed #4452
test-all

00:55:41

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:319: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:294: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1