add a readme on fcdistros and the f17 barrier

diff --git a/README-fcdistros.txt b/README-fcdistros.txt
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+# we're facing an issue for building on f17 an onwards
+# see
+# https://fedoraproject.org/wiki/Upgrading_Fedora_using_yum#Fedora_16_-.3E_Fedora_17
+# 
+# in a nutshell, building a f17 image from an earlier version is challenging
+# this means on the long run we're going to have to have build boxes run f17 or higher
+# 
+# several options could be considered
+# (*) tweak the build to use lxc-based host instead of vs; 
+#     this also requires better user tools for lxc than the stock lxctools
+#     that we've been using so far for vtest-init-lxc.sh
+# (*) assemble a f17-vs build box (not preferred at all)
+#