macros.install_pip() fails if working dir is different than /

[Martin André]

Kolla will fail to pip install when not in the root directory.

For example, this is what happens when calling the macros.install_pip() after a WORKDIR instruction that change the working directory from / to somewhere else:

INFO:kolla.common.utils.tempest-plugins:Step 4/5 : RUN if [ "$(ls /plugins)" ]; then pip --no-cache-dir install --upgrade -c requirements/upper-constraints.txt /plugins/*; fi
INFO:kolla.common.utils.tempest-plugins: ---> Running in da45dc6c7699
INFO:kolla.common.utils.tempest-plugins:Could not open requirements file: [Errno 2] No such file or directory: 'requirements/upper-constraints.txt'
INFO:kolla.common.utils.tempest-plugins:

We need to pass the absolute path to requirements/upper-constraints.txt instead of a relative path.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/539859
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=0d4760eaac6ea4b0f89b36f932e7b300875e28a4
Submitter: Zuul
Branch: master

commit 0d4760eaac6ea4b0f89b36f932e7b300875e28a4
Author: Martin André <email address hidden>
Date: Thu Feb 1 09:26:44 2018 +0100

    Use absolute path in install_pip macro

    This lets us use the macro in the case there was a WORKDIR instruction
    that changed the working directory from / earlier in the dockerfile.

    Change-Id: I2369c9997ef189e7084fac7b5ace014f6f76d698
    Closes-Bug: #1746682

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla 6.0.0.0rc1 release candidate.