CB-6973: Fix JSHint errors in src/plugman/*.js

Add JSHint config comment in all the files (sometimes with tweaks)
/* jshint node:true, bitwise:true, undef:true, trailing:true, quotmark:true,
          indent:4, unused:vars, latedef:nofunc
*/

JSHint is now happy for both src/cordova/*.js and src/plugman/*.js
not including subdirs.

Use
npm run jshint
to run jshint on all the files that have been fixed so far.