Changes

Summary

1. aegir2to3-dev: Setup host machine cache for /var/aegir/.drush/cache (details)
2. aegir2 and 3 -dev: Setup host machine cache for /var/aegir/.drush/cache (details)

Commit 93425cc585659c0f0c139f7760eca4729be520cb by Herman van Rink aegir2to3-dev: Setup host machine cache for /var/aegir/.drush/cache
	tests/functional_tests/aegir2to3-dev/Vagrantfile
Commit f9e308d1e36bc4bbb6621fc13dcadd6b4d230a10 by Herman van Rink aegir2 and 3 -dev: Setup host machine cache for /var/aegir/.drush/cache
	tests/functional_tests/aegir3-dev/Vagrantfile
	tests/functional_tests/aegir2-dev/Vagrantfile