Get rid of arbitrary 4 second sleep for SSH

CHANGELOG.md

@@ -1,5 +1,10 @@
 ## 1.2.1 (unreleased)
 
+IMPROVEMENTS:
+
+  - Get rid of arbitrary 4 second sleep when connecting via SSH. The
+    issue it was attempting to work around may be gone now.
+
 BUG FIXES:
 
   - Chef solo run list properly set. [GH-1608]

plugins/communicators/ssh/communicator.rb

@@ -238,11 +238,6 @@ module VagrantPlugins
 
         @connection = connection
 
-        # This is hacky but actually helps with some issues where
-        # Net::SSH is simply not robust enough to handle... see
-        # issue #391, #455, etc.
-        sleep 4
-
         # Yield the connection that is ready to be used and
         # return the value of the block
         return yield connection if block_given?