Fix log recursion

shell.sudo logs output to stdout/stderr intentionally. It is not meant
for scripts that generate much output (basically scripts/* files).

core of the issue is that none of the log commands require to use sudo.
they can just use normal tail. only app logs requires sudo because of the
logPaths directive in the manifest.

src/shell.js

@@ -20,7 +20,7 @@ exports = module.exports = {
 
 const SUDO = '/usr/bin/sudo';
 
-// default encoding utf8, no shell, separate args, wait for process to finish
+// default encoding utf8, no shell, handles input, separate args, wait for process to finish
 async function execArgs(tag, file, args, options) {
     assert.strictEqual(typeof tag, 'string');
     assert.strictEqual(typeof file, 'string');