Wrong pm2.pid path

[rlio]

Hi
the code inside the PM2Tracker.js get the wrong pm2.pid path.
Using var PM2_HOME = process.env.HOME + '/' + (process.env.PM2_HOME || '.pm2');,
the code prepend the user home directory to the PM2_HOME environment variable and according to the code on node_modules/pm2/paths.js

I think can be useful modify the code like this
if (process.env.PM2_HOME) PM2_HOME = process.env.PM2_HOME; else if (process.env.HOME && !process.env.HOMEPATH) PM2_HOME = p.resolve(process.env.HOME, '.pm2'); else if (process.env.HOME || process.env.HOMEPATH) PM2_HOME = p.resolve(process.env.HOMEDRIVE, process.env.HOME || process.env.HOMEPATH, '.pm2'); else { console.error('[PM2][Initialization] Environment variable HOME (Linux) or HOMEPATH (Windows) are not set!'); console.error('[PM2][Initialization] Defaulting to /etc/.pm2'); PM2_ROOT_PATH = p.resolve('/etc', '.pm2'); }