csbench: bump default sync api timeout to 300s/5mins same as async ones

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
diff --git a/csbench.go b/csbench.go
index a6e2ed7..72c98a5 100644
--- a/csbench.go
+++ b/csbench.go
@@ -313,6 +313,7 @@
 	for _, profile := range profiles {
 		if profile.Name == "admin" {
 			cs = cloudstack.NewAsyncClient(config.URL, profile.ApiKey, profile.SecretKey, false)
+			cs.Timeout(time.Duration(300 * time.Second))
 		}
 	}