Use x-terminal-emulator in lieu of xterm for connection editing. (LP: #1786978)

Summary: Removes hard requirement for xterm, which caused connection editing to fail.

Test Plan:
 1. Right click on nm-tray
 2. Click "Edit Connections"

If successful, qterminal will open, though the display will not be correct. Additional changes to lubuntu-default-settings are required, as described in the bug.

Reviewers: tsimonq2

Reviewed By: tsimonq2

Differential Revision: https://phab.lubuntu.me/D3

debian/changelog

@@ -1,7 +1,12 @@
 nm-tray (0.4.0-0ubuntu2) UNRELEASED; urgency=medium
 
+  [ Simon Quigley ]
   * Update Vcs-* for the new location.
 
+  [ Walter Lapchynski ]
+  * generalize-terminal-for-edits.patch: Use x-terminal-emulator in lieu of
+    xterm for connection editing. (LP: #1786978)
+
  -- Simon Quigley <tsimonq2@ubuntu.com>  Thu, 05 Jul 2018 17:48:30 -0500
 
 nm-tray (0.4.0-0ubuntu1) cosmic; urgency=medium

debian/patches/generalize-terminal-for-edits.patch

@@ -0,0 +1,10 @@
+Description: Use x-terminal emulator in lieu of xterm for connection edits.
+Author: Walter Lapchynski <wxl@ubuntu.com>
+Bug: https://launchpad.net/bugs/1786978 
+--- a/resources/nm-tray.conf
++++ b/resources/nm-tray.conf
+@@ -1,3 +1,3 @@
+ [General]
+-connectionsEditor=xterm, -e, nmtui-edit
++connectionsEditor=x-terminal-emulator, -e, nmtui-edit
+ enableNotifications=true

debian/patches/series

@@ -1 +1,2 @@
 fix-internal-version.patch
+generalize-terminal-for-edits.patch