Update debian images to use http.debian.net instead of being hard-coded with a US mirror

library/debian

@@ -1,10 +1,10 @@
-latest: git://github.com/tianon/docker-brew-debian@8cca9c1bba4aa246ca71b8967700623bb63735fa
-wheezy: git://github.com/tianon/docker-brew-debian@8cca9c1bba4aa246ca71b8967700623bb63735fa
-7.2: git://github.com/tianon/docker-brew-debian@8cca9c1bba4aa246ca71b8967700623bb63735fa
+latest: git://github.com/tianon/docker-brew-debian@149fa8a40b5742846243e0edd2bd641a68873144
+wheezy: git://github.com/tianon/docker-brew-debian@149fa8a40b5742846243e0edd2bd641a68873144
+7.2: git://github.com/tianon/docker-brew-debian@149fa8a40b5742846243e0edd2bd641a68873144
 
-jessie: git://github.com/tianon/docker-brew-debian@51bf81b164ec5e788099136cbe9dd9e141140d4c
+jessie: git://github.com/tianon/docker-brew-debian@6b80be230090cd2373047ee3408a8285f33d88c3
 
-sid: git://github.com/tianon/docker-brew-debian@d532462cfbae0d9809c3c24f9855291bf1142c1a
+sid: git://github.com/tianon/docker-brew-debian@ad54ef16a1c44ed0b8874c1a4090019aff609284
 
-squeeze: git://github.com/tianon/docker-brew-debian@af59cb2f4237f07713a369ee7def53bad7e46506
-6.0.8: git://github.com/tianon/docker-brew-debian@af59cb2f4237f07713a369ee7def53bad7e46506
+squeeze: git://github.com/tianon/docker-brew-debian@e9519637347231a80822fe49e2369739647822b2
+6.0.8: git://github.com/tianon/docker-brew-debian@e9519637347231a80822fe49e2369739647822b2