Use argv arrays for telegraf inputs.exec commands

Telegraf 1.39 deprecated bare string entries in inputs.exec commands and
will drop them in 1.45, warning on every start:

  W! DeprecationWarning: Value "/scripts/esindexsize.sh" for option
  "command" of plugin "inputs.exec" deprecated since version 1.39.0

Each entry is now a single-element argv array. Array form skips shell
parsing, which is fine here: every command is a bare script path from
telegraf's scripts list, no args or shell metacharacters.

salt/telegraf/etc/telegraf.conf

@@ -335,7 +335,7 @@
 {%-   do TELEGRAFMERGED.scripts[GLOBALS.role.split('-')[1]].remove('sostatus.sh') %}
 [[inputs.exec]]
    commands = [
-      "/scripts/sostatus.sh"
+      ["/scripts/sostatus.sh"]
    ]
    data_format = "influx"
    timeout = "15s"
@@ -346,7 +346,7 @@
 [[inputs.exec]]
    commands = [
 {%-   for script in TELEGRAFMERGED.scripts[GLOBALS.role.split('-')[1]] %}
-      "/scripts/{{script}}"{% if not loop.last %},{% endif %}
+      ["/scripts/{{script}}"]{% if not loop.last %},{% endif %}
 {%-   endfor %}
    ]
   data_format = "influx"
@@ -375,7 +375,7 @@
 {%- if GLOBALS.is_manager or GLOBALS.role == 'so-heavynode' %}
 [[ inputs.exec ]]
   commands = [
-    "/scripts/esindexsize.sh"
+    ["/scripts/esindexsize.sh"]
   ]
   data_format = "influx"
   interval = "1h"