Use per-test-unique host names

Avoids race conditions with immediately re-used LVs.

NEWS.markdown

@@ -38,7 +38,13 @@ Other Changes
   to cope with risen resource consumption and availability. (Closes
   Debian bug report #776487)
 * Default file system is now ext4 (instead of ext3).
-* release-testing: Work around umount race condition between tests.
+
+Test Suite
+----------
+
+* release-testing:
+  + Use per-test-unique host names. Avoids race conditions with
+    immediately re-used LVs.
 
 
 xen-tools 4.6.2 (released 23 Dec 2015)

examples/release-testing

@@ -1,9 +1,6 @@
 #!/bin/sh
 
 # Skip dapper and edgy due to bug #659360 in debootstrap
-for dist in $(awk '!/^#|^$/ {print $1}' /etc/xen-tools/distributions.conf | egrep -v '^(dapper|edgy)$'); do
-    xen-create-image --dist $dist --force --verbose "$@" || break
-    # Work around umount being sometimes too slow
-    sync
-    sleep 5
+for dist in $(awk '!/^#|^$/ {print $1}' /etc/xen-tools/distributions.conf | egrep -v '^(dapper|edgy|buster|bullseye)$'); do
+    xen-create-image --dist $dist --hostname "xen-tools-release-testing-$dist" --force --verbose "$@" || break
 done 2>&1 | tee xen-tools-release-testing.log