puppet: change branch to 'main' for some recipes

The default branch in github for the following recipes
is changed from 'master' to 'main':
- puppetlabs-apache
- puppetlabs-concat
- puppetlabs-firewall
- puppetlabs-haproxy
- puppetlabs-inifile
- puppetlabs-mysql
- puppetlabs-postgresql
- puppetlabs-stdlib

Issue-ID: INF-215

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Change-Id: I1fe4754be32b7ef40d73b99e605b943d6a7499d2