Bump debhelper compat to 7

debian/changelog

@@ -17,6 +17,8 @@ xen-tools (4.2~rc1-1) UNRELEASED; urgency=low
   * Downgrade reiserfsprogs, xfsprogs and rinse to Suggests. (Closes:
     #561618)
   * Bump Standards-Version to 3.8.4 (no changes necessary)
+  * Bump Debhelper Compatibility to 7
+    - Replace "dh_clean -k" by "dh_prep"
   * Add Vcs-* headers pointing to new upstream and packaging repository
   * Fix some Lintian warnings:
     - [debian/control]: debhelper-but-no-misc-depends

debian/compat

@@ -1 +1 @@
-4
+7

debian/rules

@@ -25,7 +25,7 @@ clean:
 install: build
 	dh_testdir
 	dh_testroot
-	dh_clean -k 
+	dh_prep
 
 	make manpages
 	make install prefix=`pwd`/debian/xen-tools