Travis CI: allow failure only on experimental targets

Rawhide and Sid are bleeding edge technlogies.

.travis.yml

@@ -36,20 +36,20 @@ env:
 
 matrix:
     allow_failures:
-      - env: PACK=source
-      - env: OS=el DIST=6 PACK=rpm
-      - env: OS=el DIST=7 PACK=rpm
-      - env: OS=fedora DIST=23 PACK=rpm
-      - env: OS=fedora DIST=24 PACK=rpm
-      - env: OS=fedora DIST=25 PACK=rpm
+#      - env: PACK=source
+#      - env: OS=el DIST=6 PACK=rpm
+#      - env: OS=el DIST=7 PACK=rpm
+#      - env: OS=fedora DIST=23 PACK=rpm
+#      - env: OS=fedora DIST=24 PACK=rpm
+#      - env: OS=fedora DIST=25 PACK=rpm
       - env: OS=fedora DIST=rawhide PACK=rpm
-      - env: OS=ubuntu DIST=precise PACK=deb
-      - env: OS=ubuntu DIST=trusty PACK=deb
-      - env: OS=ubuntu DIST=xenial PACK=deb
-      - env: OS=ubuntu DIST=yakkety PACK=deb
-      - env: OS=debian DIST=jessie PACK=deb
-      - env: OS=debian DIST=wheezy PACK=deb
-      - env: OS=debian DIST=stretch PACK=deb
+#      - env: OS=ubuntu DIST=precise PACK=deb
+#      - env: OS=ubuntu DIST=trusty PACK=deb
+#      - env: OS=ubuntu DIST=xenial PACK=deb
+#      - env: OS=ubuntu DIST=yakkety PACK=deb
+#      - env: OS=debian DIST=wheezy PACK=deb
+#      - env: OS=debian DIST=jessie PACK=deb
+#      - env: OS=debian DIST=stretch PACK=deb
       - env: OS=debian DIST=sid PACK=deb
 
     exclude: