HTTP Handler Bind to 0.0.0.0 or ReverseListenerBindAddress

This commit returns the HTTP/S handler to its former semantic glory.
By default the HTTP/S handler will bind to :: or 0.0.0.0. If the
user specifies a ReverseListenerBindAddress then, instead, the
server will bind to that address.

The previous commit to change the URL to always reference LHOST
should go with this too. LHOST is always my intent of where the
stage should call home too. ReverseListenerBindAddress would make
sense as my intent as to where I want to bind to. The two options
shouldn't take on each other's meanings.

lib/msf/core/handler/reverse_http.rb

@@ -83,7 +83,6 @@ module ReverseHttp
   # addresses.
   #
   def full_uri
-    addrs = bind_address
     local_port = bind_port
     scheme = (ssl?) ? "https" : "http"
     "#{scheme}://#{datastore['LHOST']}:#{local_port}/"
@@ -175,12 +174,18 @@ module ReverseHttp
     end
 
     local_port = bind_port
-    addrs = bind_address
+
+    # Determine where to bind the HTTP(S) server to
+    bindaddrs = ipv6 ? '::' : '0.0.0.0'
+
+    if not datastore['ReverseListenerBindAddress'].to_s.empty?
+      bindaddrs = datastore['ReverseListenerBindAddress']
+    end
 
     # Start the HTTPS server service on this host/port
     self.service = Rex::ServiceManager.start(Rex::Proto::Http::Server,
       local_port,
-      addrs[0],
+      bindaddrs,
       ssl?,
       {
         'Msf'        => framework,