Make DRb::DRbServer.load_limit configurable

Make the DRb::DRbServer.load_limit config variable configurable through
worker settings.

https://bugzilla.redhat.com/show_bug.cgi?id=1573588

lib/VMwareWebService/MiqVimBroker.rb

@@ -19,9 +19,6 @@ def to_obj(ref)
 
   attr_reader :shuttingDown
 
-  MB = 1048576
-  DRb::DRbServer.default_load_limit(50 * MB)
-
   @@preLoad   = false
   @@debugUpdates  = false
   @@classModed  = false
@@ -31,6 +28,7 @@ def to_obj(ref)
   @@selectorHash  = {}
   @@maxWait    = 60
   @@maxObjects = 250
+  @@loadLimit  = 25
 
   def initialize(mode = :client, port = 9001)
     if mode == :client
@@ -95,7 +93,7 @@ def new_with(uri, ref)
 
       acl = ACL.new(%w( deny all allow 127.0.0.1/32 ))
       DRb.install_acl(acl)
-      DRb.start_service("druby://127.0.0.1:#{port}", self, :idconv => VimBrokerIdConv.new)
+      DRb.start_service("druby://127.0.0.1:#{port}", self, :idconv => VimBrokerIdConv.new, :load_limit => @@loadLimit)
     else
       raise "MiqVimBroker: unrecognized mode #{mode}"
     end
@@ -332,6 +330,14 @@ def self.maxObjects
     @@maxObjects
   end
 
+  def self.loadLimit=(val)
+    @@loadLimit = val
+  end
+
+  def self.loadLimit
+    @@loadLimit
+  end
+
   def releaseSession(sessionId)
     if @mode == :client
       $vim_log.info "Client releaseSession: #{sessionId}"