Optimize prompt search in Tramp

* lisp/net/tramp.el (tramp-search-regexp): New defun.
(tramp-check-for-regexp, tramp-process-sentinel):
* lisp/net/tramp-adb.el (tramp-adb-send-command-and-check)
(tramp-adb-wait-for-output):
* lisp/net/tramp-sh.el (tramp-wait-for-output)
(tramp-send-command-and-check):
* lisp/net/tramp-smb.el (tramp-smb-handle-set-file-acl):
Bind search length.
2 jobs for master in 61 minutes and 59 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #4491
test-all

01:01:59

passed #4492
test-filenotify-gio

00:44:24

 
Name Stage Failure
failed
test-all Test
Makefile:319: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
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