v1.15

This change includes a couple of fixes for the GRUB2 parser.

Changes in this release:

Fixed

1. GRUB parser: bls: Fix NULL pointer dereference on empty values

2. GRUB parser: use new define syntax for yacc source

Changed

1. pb-console: we now silence the kernel log messages printed to console earlier in setup

Thanks to Reza Arbab for contributing!