The undercloud actually has dib run twice on it - once to create
the instack image, and again when we run instack itself. The
first run creates the dib-python symlink, and the second blows up
because the link already exists. Force the link creation so the
script is idempotent.
Change-Id: I78f9e6f5afcf8ebe6d7911a7a434525ba7c737cf
Use dib-python to run package-installs using the provided python
version. Automatically detect the python version for our
package-installs-squash since that runs outside the chroot.
Change-Id: I926022bcf8cbcd81b051026ffd5d6477650045ad
Creating an element which we can use in #! lines to refer to either
python2 or python3 depending on what it available.
Change-Id: Ic47e18ad21c33ab9f0d11c04260a33725aeee814
