Configurable zero pool size in case of newdeploy function (#1121)

It should be possible to keep zero pool size when the environment is created so that there are no idle resources for a newdeploy function. Fixes: https://github.com/fission/fission/issues/1104

fission/environment.go

@@ -93,6 +93,9 @@ func envCreate(c *cli.Context) error {
 			envBuildCmd = "build"
 		}
 	}
+	if c.IsSet("poolsize") {
+		envVersion = 3
+	}
 
 	keepArchive := c.Bool("keeparchive")