Changed call to EDITOR to allow for parameters

The EDITOR environment variable is used to create and edit files in the vault.
But if the EDITOR variable contains parameters, subprocess.call() breaks.

This fixes the EDITOR environment variable to be safely split into a list.
It adds a dependency on shlex.

lib/ansible/utils/vault.py

@@ -19,6 +19,7 @@
 # installs ansible and sets it up to run on cron.
 
 import os
+import shlex
 import shutil
 import tempfile
 from io import BytesIO
@@ -189,8 +190,7 @@ class VaultEditor(object):
             raise errors.AnsibleError("%s exists, please use 'edit' instead" % self.filename)
 
         # drop the user into vim on file
-        EDITOR = os.environ.get('EDITOR','vim')
-        call([EDITOR, self.filename])
+        call(self._editor_shell_command(self.filename))
         tmpdata = self.read_data(self.filename)
         this_vault = VaultLib(self.password)
         this_vault.cipher_name = self.cipher_name
@@ -226,8 +226,7 @@ class VaultEditor(object):
         self.write_data(dec_data, tmp_path)
 
         # drop the user into vim on the tmp file
-        EDITOR = os.environ.get('EDITOR','vim')
-        call([EDITOR, tmp_path])
+        call(self._editor_shell_command(tmp_path))
         new_data = self.read_data(tmp_path)
 
         # create new vault
@@ -299,6 +298,13 @@ class VaultEditor(object):
             os.remove(dest)
         shutil.move(src, dest)
 
+    def _editor_shell_command(self, filename):
+        EDITOR = os.environ.get('EDITOR','vim')
+        editor = shlex.split(EDITOR)
+        editor.append(filename)
+
+        return editor
+
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