Fix pyOpenSSL on Fedora.

On fedora 18 the package pyOpenSSL is conflicting with one of the
packages needed to build the bootstack image. The problem gets sorted
if you install pyOpenSSL at the beginning of the image building process
and this is what this patch is doing.

Change-Id: I681683b81ad638dfeb690fde1bc7d08a2116aaed
Merge "Fix pyOpenSSL on Fedora."