Provide tramp-sh-handle-make-process

Provide tramp-sh-handle-make-process

* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist):
Add `tramp-sh-handle-make-process' and
`tramp-handle-start-file-process'.
(tramp-sh-handle-make-process): New defun, derived from
`tramp-sh-handle-start-file-process'.  (Bug#28691)

* lisp/net/tramp.el (tramp-handle-start-file-process): New defun.

* test/lisp/net/tramp-tests.el (tramp-test30-make-process):
New test.
(tramp-test31-interrupt-process, tramp-test32-shell-command)
(tramp-test33-environment-variables)
(tramp-test33-environment-variables-and-port-numbers)
(tramp-test34-explicit-shell-file-name, tramp-test35-exec-path)
(tramp-test35-remote-path, tramp-test36-vc-registered)
(tramp-test37-make-auto-save-file-name)
(tramp-test38-find-backup-file-name)
(tramp-test39-make-nearby-temp-file)
(tramp-test40-special-characters)
(tramp-test40-special-characters-with-stat)
(tramp-test40-special-characters-with-perl)
(tramp-test40-special-characters-with-ls, tramp-test41-utf8)
(tramp-test41-utf8-with-stat, tramp-test41-utf8-with-perl)
(tramp-test41-utf8-with-ls, tramp-test42-file-system-info)
(tramp-test43-asynchronous-requests, tramp-test44-auto-load)
(tramp-test44-delay-load, tramp-test44-recursive-load)
(tramp-test44-remote-load-path, tramp-test45-unload): Rename.