Add a new 'guest-get-osinfo' command for reporting basic information of
the guest operating system. This includes machine architecture,
version and release of the kernel and several fields from os-release
file if it is present (as defined in [1]).

[1] https://www.freedesktop.org/software/systemd/man/os-release.htmlSigned-off-by: NVinzenz Feenstra <vfeenstr@redhat.com>
Signed-off-by: NTomáš Golembiovský <tgolembi@redhat.com>
* moved declarations to beginning of functions
* dropped unecessary initialization of struct utsname
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>