Merge changes from topic "kernel_config_arch"

* changes:
  Add tests for kernel config fragments in fwk comp mat.
  Do not allow first <kernel> version to have non-empty <condition>.
  Remove unused CompatibilityMatrix::findKernel
  Improve error messages in parse_xml.cpp
  Match /proc/config.gz with fwk comp mat <kernel> fragments
  Add <conditions> to <kernel> in framework compat mat