Add Tramp support of direct asynchronous process invocation

* doc/misc/tramp.texi (Predefined connection information):
Add "direct-async-process".
(Remote processes): New subsection "Improving performance of
asynchronous remote processes".

* lisp/net/tramp-adb.el (tramp-methods) <adb>: Add `tramp-login-program'
and `tramp-login-args'.
(tramp-adb-handle-make-process): Use `tramp-handle-make-process'.
(tramp-adb-maybe-open-connection): Add "set +o vi +o emacs" command.

* lisp/net/tramp-sh.el (tramp-sh-handle-make-process):
Use `tramp-handle-make-process'.
(tramp-sh-file-name-handler-p, tramp-multi-hop-p): New defuns.
(tramp-compute-multi-hops): Use `tramp-multi-hop-p'.

* lisp/net/tramp.el (tramp-dissect-file-name, tramp-dissect-hop-name):
Use `tramp-multi-hop-p'.
(tramp-handle-insert-file-contents, tramp-local-host-p):
Use `tramp-sh-file-name-handler-p'.
(tramp-handle-make-process): New defun.

* test/README: Add another example how to use SELECTOR.

* test/lisp/net/tramp-tests.el (tramp-test03-file-name-method-rules):
Adapt test.
(tramp--test-sh-p): Use `tramp-sh-file-name-handler-p'.

1 files changed, 5 insertions, 0 deletions

diff --git a/test/README b/test/README
index 1f69f7142c1..fe05b5403b1 100644
--- a/test/README
+++ b/test/README
@@ -64,6 +64,11 @@ protect against "make" variable expansion):
 
     make <filename> SELECTOR='"foo$$"'
 
+In case you want to use the symbol name of a test as selector, you can
+use it directly:
+
+    make <filename> SELECTOR='test-foo-remote'
+
 Note that although the test files are always compiled (unless they set
 no-byte-compile), the source files will be run when expensive or
 unstable tests are involved, to give nicer backtraces.  To run the