Remove .gitreview

It's an upstream project so it should have a .gitreview file.

Change-Id: Ie10adecd2ae84d47c199d99af6523a6518a2a20c
diff --git a/.gitreview b/.gitreview
deleted file mode 100644
index 48e5fd9..0000000
--- a/.gitreview
+++ /dev/null
@@ -1,4 +0,0 @@
-[gerrit]
-host=mcp-ci-gerrit
-port=29418
-project=salt-formulas/xtrabackup.git