Make Debian guest detection more reliable
Make Debian guest detection more reliable

/etc/issue is far from being a reliable source for OS detection as it
can be changed by a user without affecting any OS functionality. As
newer Debian systems run systemd by default, check for /etc/os-release
and fallback to lsb_release for older Debian versions. Check #7625 for
a similar issue. Even lsb_release is not manatory, therefore keep the
current code of parsing /etc/issue to avoid regressions.

jtopper/vagrant,benh57/vagrant,jtopper/vagrant,PatrickLang/vagrant,crashlytics/vagrant,mwrock/vagrant,mwrock/vagrant,PatrickLang/vagrant,crashlytics/vagrant,bdwyertech/vagrant,PatrickLang/vagrant,sni/vagrant,jtopper/vagrant,jtopper/vagrant,crashlytics/vagrant,bryson/vagrant,lukebakken/vagrant,mitchellh/vagrant,PatrickLang/vagrant,chrisroberts/vagrant,taliesins/vagrant,mitchellh/vagrant,taliesins/vagrant,justincampbell/vagrant,mwrock/vagrant,gitebra/vagrant,sni/vagrant,lukebakken/vagrant,crashlytics/vagrant,bshurts/vagrant,taliesins/vagrant,justincampbell/vagrant,bdwyertech/vagrant,gitebra/vagrant,lukebakken/vagrant,sni/vagrant,justincampbell/vagrant,gitebra/vagrant,chrisroberts/vagrant,marxarelli/vagrant,justincampbell/vagrant,benh57/vagrant,bshurts/vagrant,chrisroberts/vagrant,gitebra/vagrant,bryson/vagrant,marxarelli/vagrant,bryson/vagrant,lukebakken/vagrant,chrisroberts/vagrant,bshurts/vagrant,taliesins/vagrant,benh57/vagrant,sni/vagrant,mitchellh/vagrant,mwrock/vagrant,marxarelli/vagrant,bdwyertech/vagrant,bshurts/vagrant,bryson/vagrant,marxarelli/vagrant,mitchellh/vagrant,benh57/vagrant,bdwyertech/vagrant