use random ports to minimize address conflicts

Author: colinsurprenant

spec/inputs/tcp_spec.rb

@@ -33,7 +33,7 @@
 
  it "should read plain with unicode" do
  event_count = 10
- port = 5511
+ port = rand(1024..65535)
  conf = <<-CONFIG
  input {
  tcp {
@@ -61,7 +61,7 @@
  end
 
  it "should read events with plain codec and ISO-8859-1 charset" do
- port = 5513
+ port = rand(1024..65535)
  charset = "ISO-8859-1"
  conf = <<-CONFIG
  input {
@@ -89,7 +89,7 @@
  end
 
  it "should read events with json codec" do
- port = 5514
+ port = rand(1024..65535)
  conf = <<-CONFIG
  input {
  tcp {
@@ -124,7 +124,7 @@
  end
 
  it "should read events with json codec (testing 'host' handling)" do
- port = 5517
+ port = rand(1024..65535)
  conf = <<-CONFIG
  input {
  tcp {
@@ -151,7 +151,7 @@
  end
 
  it "should read events with json_lines codec" do
- port = 5515
+ port = rand(1024..65535)
  conf = <<-CONFIG
  input {
  tcp {
@@ -190,7 +190,7 @@
 
  it "should one message per connection" do
  event_count = 10
- port = 5516
+ port = rand(1024..65535)
  conf = <<-CONFIG
  input {
  tcp {