Don't check for pidfile when running commands

This will allow running commands against a Spring server which is not
running directly on the same machine. Specifically I'm making this
change to enable running a Spring server inside a Docker container, and
then connecting to it from outside the container (i.e. on a host
machine).

Author: jonleighton

lib/spring/client/run.rb

@@ -8,6 +8,8 @@ class Run < Command
       FORWARDED_SIGNALS = %w(INT QUIT USR1 USR2 INFO WINCH) & Signal.list.keys
       TIMEOUT = 1
 
+      attr_reader :server
+
       def initialize(args)
         super
         @signal_queue = []
@@ -17,20 +19,20 @@ def log(message)
         env.log "[client] #{message}"
       end
 
-      def server
-        @server ||= UNIXSocket.open(env.socket_name)
+      def connect
+        @server = UNIXSocket.open(env.socket_name)
       end
 
       def call
-        if env.server_running?
-          warm_run
-        else
+        begin
+          connect
+        rescue Errno::ENOENT, Errno::ECONNRESET
           cold_run
+        else
+          warm_run
         end
-      rescue Errno::ECONNRESET
-        exit 1
       ensure
-        server.close if @server
+        server.close if server
       end
 
       def warm_run
@@ -49,6 +51,7 @@ def warm_run
 
       def cold_run
         boot_server
+        connect
         run
       end
 
@@ -60,6 +63,8 @@ def run
         queue_signals
         connect_to_application(client)
         run_command(client, application)
+      rescue Errno::ECONNRESET
+        exit 1
       end
 
       def boot_server