In unmerge(), flush the vardbapi aux_get() cache to disk before releasing
the vardb lock. (trunk r10361)

svn path=/main/branches/2.1.2/; revision=10363
diff --git a/bin/emerge b/bin/emerge
index b5589bc..fbc797a 100755
--- a/bin/emerge
+++ b/bin/emerge
@@ -6476,6 +6476,7 @@
 			return 0
 	finally:
 		if vdb_lock:
+			vartree.dbapi.flush_cache()
 			portage_locks.unlockdir(vdb_lock)
 
 	# Unmerge order only matters in some cases