Wrong order of default installation parameters for msiexec

[dryzhov]

Steps to reproduce:

1. create software installation recipe without definition of flags
2. launch recipe

Result: msiexec dialog window with usage information

Expected result: installed msi package

Analyze:
Function policies/recipes/steps.go/stepInstallMsi contains code with default msiexec options

   args := step.Flags
   if len(args) == 0 {
   	args = []string{"/i", "/qn", "/norestart"}
   }
   args = append(args, path)

where path contain full path to *.msi file

By msiexec documentation parameter /i must contain value - package or product code. Then code may look like this:

	args := step.Flags
	if len(args) == 0 {
		args = []string{"/qn", "/norestart", "/i"}
	}
	args = append(args, path)