test-tx-rollback: more lenient glob for kill status (issue6807)

The "killed" message may have some prefix and/or suffix which differ
depending on the platform.

This makes the pinned test output more lenient to accept those.

tests/test-transaction-rollback-on-revlog-split.t

@@ -130,7 +130,7 b' Reference size:'
 #else
   $ hg pull ../troffset-computation
   pulling from ../troffset-computation
-  Killed
+  *Killed* (glob)
   [137]
 #endif
 
@@ -210,7 +210,7 b' Reference size:'
   adding changesets
   adding manifests
   adding file changes
-  Killed
+  *Killed* (glob)
   [137]
 #endif
 
@@ -275,7 +275,7 b' Reference size:'
   adding changesets
   adding manifests
   adding file changes
-  Killed
+  *Killed* (glob)
   [137]
 #endif