(#28) Add new ssh command to vmfloaty

This commit adds a new feature to vmfloaty. It grabs a single vm from
the pooler based on the os template provided and then attempts to ssh
into it from the host machine.

lib/vmfloaty/ssh.rb

@@ -0,0 +1,43 @@
+class Ssh
+
+  def self.which(cmd)
+    # Gets path of executable for given command
+
+    exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
+    ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
+      exts.each { |ext|
+        exe = File.join(path, "#{cmd}#{ext}")
+        return exe if File.executable?(exe) && !File.directory?(exe)
+      }
+    end
+    return nil
+  end
+
+  def self.ssh(verbose, host_os, token, url)
+    ssh_path = which("ssh")
+    if !ssh_path
+      raise "Could not determine path to ssh"
+    end
+    os_types = {}
+    os_types[host_os] = 1
+
+    response = Pooler.retrieve(verbose, os_types, token, url)
+    if response["ok"] == true
+      if host_os =~ /win/
+        user = "Administrator"
+      else
+        user = "root"
+      end
+
+      hostname = "#{response[host_os]["hostname"]}.#{response["domain"]}"
+      cmd = "#{ssh_path} #{user}@#{hostname}"
+
+      # TODO: Should this respect more ssh settings? Can it be configured
+      #       by users ssh config and does this respect those settings?
+      Kernel.exec(cmd)
+    else
+      raise "Could not get vm from vmpooler:\n #{response}"
+    end
+    return
+  end
+end