Upstream: consistently initialize explicit upstreams.

When an upstream{} block follows a proxy_pass reference to it,
such an upstream inherited port and default_port settings from
proxy_pass.  This was different from when they came in another
order (see ticket #1059).  Explicit upstreams should not have
port and default_port in any case.

This fixes the following case:

	server { location / { proxy_pass http://u; } ... }
	upstream u { server 127.0.0.1; }
	server { location / { proxy_pass https://u; } ... }

but not the following:

	server { location / { proxy_pass http://u; } ... }
	server { location / { proxy_pass https://u; } ... }
	upstream u { server 127.0.0.1; }

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 55bd47d..828b7d7 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -5768,6 +5768,8 @@
 
         if (flags & NGX_HTTP_UPSTREAM_CREATE) {
             uscfp[i]->flags = flags;
+            uscfp[i]->port = 0;
+            uscfp[i]->default_port = 0;
         }
 
         return uscfp[i];