Updating server dependancies. Also adding github.com/jaytaylor/html2text and gopkg.in/gomail.v2 (#5748)

vendor/github.com/prometheus/procfs/fs_test.go

@@ -11,3 +11,16 @@ func TestNewFS(t *testing.T) {
 		t.Error("want NewFS to fail if mount point is not a directory")
 	}
 }
+
+func TestFSXFSStats(t *testing.T) {
+	stats, err := FS("fixtures").XFSStats()
+	if err != nil {
+		t.Fatalf("failed to parse XFS stats: %v", err)
+	}
+
+	// Very lightweight test just to sanity check the path used
+	// to open XFS stats. Heavier tests in package xfs.
+	if want, got := uint32(92447), stats.ExtentAllocation.ExtentsAllocated; want != got {
+		t.Errorf("unexpected extents allocated:\nwant: %d\nhave: %d", want, got)
+	}
+}