Use sshx instead of ssh in cider-select-endpoint

Modified cider-select-endpoint function to use sshx instead of ssh.
This change is useful for users using well-configured login shell and ssh-config.

Author: Takashi AOKI

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 * [#934](https://github.com/clojure-emacs/cider/issues/934): Remove
   `cider-turn-on-eldoc-mode` in favor of simply using `eldoc-mode`.
+* [#953](https://github.com/clojure-emacs/cider/pull/953) Use `sshx` instead of `ssh` in `cider-select-endpoint`
 
 ### Bugs fixed
 

cider.el

@@ -207,7 +207,7 @@ Create REPL buffer and start an nREPL client connection."
                          (let* ((change-dir-p (file-remote-p default-directory))
                                 (default-directory (if change-dir-p "~/" default-directory)))
                            (cider-locate-running-nrepl-ports (unless change-dir-p default-directory)))
-                       (let ((vec (vector "ssh" nil host "" nil))
+                       (let ((vec (vector "sshx" nil host "" nil))
                              ;; might connect to a different remote
                              (dir (when (file-remote-p default-directory)
                                     (with-parsed-tramp-file-name default-directory cur