Get rid of rootfs removal on lxc-templates

I'm not even sure why I added this but removing it fixes #81

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## [0.?.?](https://github.com/fgrehm/vagrant-lxc/compare/v0.3.4...master) (unreleased)
 
+  - BTRFS-friendly base boxes [#81](https://github.com/fgrehm/vagrant-lxc/issues/81)
   - Extended templates path lookup [#77](https://github.com/fgrehm/vagrant-lxc/issues/77) (tks to @aries1980)
   - Fix default group on the rake task [#82](https://github.com/fgrehm/vagrant-lxc/issues/82) (tks to @cduez)
 

boxes/debian/lxc-template

@@ -117,8 +117,6 @@ extract_rootfs()
 
     echo "Extracting $tarball ..."
     mkdir -p $(dirname $rootfs)
-    # Make sure the rootfs does not exist before extracting
-    rm -rf $rootfs
     (cd `dirname $rootfs` && tar xfz $tarball)
     return 0
 }

boxes/ubuntu/lxc-template

@@ -165,8 +165,6 @@ extract_rootfs()
 
     echo "Extracting $tarball ..."
     mkdir -p $(dirname $rootfs)
-    # Make sure the rootfs does not exist before extracting
-    rm -rf $rootfs
     (cd `dirname $rootfs` && tar xfz $tarball)
     return 0
 }