Bump versions of linux headers in trusty OS image test

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Update bosh-agent

This includes a cherry-pick of a807749, which is an update to a timebomb
test.

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Convert openstack image to qcow2 0.10 compat

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Signed-off-by: Kris Hicks <krishicks@gmail.com>
Make instance type configurable in Openstack BATs

via BOSH_OPENSTACK_FLAVOR

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Revert "Add os_image_s3_version to build and publish cmd"

This reverts commit 0e69492dc22b031a1656ded8092fc7c6ada30408.
Revert "Add os_image_s3_version to publish_stemcell_in_vm"

This reverts commit 2b493770b97e917144307f14cc7dff3e094a85a1.
Revert "Add and require os_image_version for stemcell:build"

This reverts commit 02d7e67cd7de4aa07ecd8c374a84cbda982c29db.
Lock down os_image_version in code

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Update OS_IMAGES.md

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Set net_id only if BOSH_OPENSTACK_NET_ID present

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Merge branch '2719.2' into develop

Signed-off-by: Kris Hicks <krishicks@gmail.com>

Conflicts:
	go/src/github.com/cloudfoundry/bosh-agent
	stemcell_builder/stages/image_openstack_qcow2/apply.sh
Update trusty OS image
Switch m1.small to m1.medium in bosh_cli_plugin_aws
Update BATs to use m1.medium
Only set net_id if specified in BATs
Configure flavor without ephemeral disk

via BOSH_OPENSTACK_FLAVOR_WITH_NO_EPHEMERAL_DISK

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>