Update common-packer to v0.4.2

- Pull in  Add GitLint which replaces GitCommitBear
- Pull in Use netselect to choose a package mirror
- Pull in Revert "Use apt-get to install python-minimal"

Change-Id: I547a81c75b65663f54e646adae8b5ee1f30f0eef
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>

diff --git a/packer/common-packer b/packer/common-packer
index 9eca5443d48cde7a5f16e16cb16d89e3cd3ab66c..c024a2568d2c87e303a07ffaf7e6093096dbddbe 160000 (submodule)
--- a/packer/common-packer
+++ b/packer/common-packer
@@ -1 +1 @@
-Subproject commit 9eca5443d48cde7a5f16e16cb16d89e3cd3ab66c
+Subproject commit c024a2568d2c87e303a07ffaf7e6093096dbddbe