Client build fixes (#305)

* Some client build fixes.

* Removed tests dir, was for Titan.

clients/utils.rb

@@ -0,0 +1,38 @@
+require 'open3'
+
+class ExecError < StandardError 
+  attr_accessor :exit_status, :last_line
+  
+  def initialize(exit_status, last_line)
+    super("Error on cmd. #{exit_status}")
+    self.exit_status = exit_status
+    self.last_line = last_line
+  end
+end
+
+def stream_exec(cmd)
+  puts "Executing cmd: #{cmd}"
+  exit_status = nil
+  last_line = ""
+  Open3.popen2e(cmd) do |stdin, stdout_stderr, wait_thread|
+    Thread.new do
+      stdout_stderr.each {|l| 
+        puts l
+        # Save last line for error checking
+        last_line = l
+      }
+    end
+
+    # stdin.puts 'ls'
+    # stdin.close
+
+    exit_status = wait_thread.value
+    raise ExecError.new(exit_status, last_line) if exit_status.exitstatus != 0
+  end
+  return exit_status
+end
+
+def exec(cmd)
+  puts "Executing: #{cmd}"
+  puts `#{cmd}`
+end