Set headers properly in Bosh::Blobstore::DavBlobstoreClient

Due to a backwards-incompatible change to the delete method of
HTTPClient, headers must be either explicitly passed via:

client.delete(uri, headers: headers)

or

client.delete(uri, {}, headers)

where the first hash is the body to pass to delete.

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Upgrade stemcell-building vm to trusty

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Define Bosh::Common module in bosh_common version package

Files are required separately by director fail with
uninitialized constant Bosh::Common

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Lock down dependency on httpclient in vsphere cpi to 2.4.0

This fixes dependency issue in Ruby 1.9.3

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>