Remove port from JSLocation when returning packager host

Summary:
Changelog:
Some callsites may rely on the assumption that address return by this method does not contain port information. JSLocation saved in NSUserDefault might contain port information, removing it here can prevent the issue for callsites.

Differential Revision: D23240495

fbshipit-source-id: a2edf4abb086fd951dd089331407bd659aad1729

React/Base/RCTBundleURLProvider.mm

@@ -125,6 +125,12 @@ + (BOOL)isPackagerRunning:(NSString *)host
 - (NSString *)packagerServerHost
 {
   NSString *location = [self jsLocation];
+  if (location) {
+    NSInteger index = [location rangeOfString:@":"].location;
+    if (index != NSNotFound) {
+      location = [location substringToIndex:index];
+    }
+  }
 #if RCT_DEV_MENU
   if ([location length] && ![RCTBundleURLProvider isPackagerRunning:location]) {
     location = nil;