osdict: Manually tweak 'supported' info

Many old OSes don't have an EOL date tracked with libosinfo, and
we just treat them as 'supported'. So the default distro list in
the create wizard is wayyy too huge and contains all sorts of
crazy options.

Assume lack of EOL date means 'unsupported', and add a manual whitelist
for some still common distros. We will fix this at the libosinfo level.

virtinst/osdict.py

@@ -434,9 +434,20 @@ class _OsVariantOsInfo(_OSVariant):
 
     def _get_supported(self):
         d = self._os.get_eol_date_string()
-        if self._os.get_distro() == "msdos":
-            return False
-        return d is None or datetime.strptime(d, "%Y-%m-%d") > datetime.now()
+        name = self._os.get_short_id()
+
+        if d:
+            return datetime.strptime(d, "%Y-%m-%d") > datetime.now()
+
+        # As of libosinfo 2.11, many clearly EOL distros don't have an
+        # EOL date. So assume None == EOL, add some manual work arounds.
+        # We should fix this in a new libosinfo version, and then drop
+        # this hack
+        if name in ["rhel7.0", "rhel7.1", "fedora19", "fedora20", "fedora21",
+            "debian6", "debian7", "ubuntu13.04", "ubuntu13.10", "ubuntu14.04",
+            "ubuntu14.10", "win8", "win8.1", "win2k12", "win2k12r2"]:
+            return True
+        return False
 
     def _get_urldistro(self):
         urldistro = self._os.get_distro()