Maintenance: Install python-lzo from pip

[EdwardLarson]

• [ ] I have reviewed the OFRAK contributor guide and attest that this pull request is in accordance with it.

One sentence summary of this PR (This should go in the CHANGELOG!) Move/"promote" python-lzo module from an external dependency of the Ubi and Ubifs components to a normal pip dependency

Link to Related Issue(s) Not sure why python-lzo was marked as an external dependency originally, but it seems erroneous. It of course adds an extra dependency not installed as part of a pip install.

Please describe the changes in your request. Remove that dependency object and installation line in Dockerstub, add it to requirements.txt. Also make a small change to one of the ofrak server tests, that sometimes causes a problem (this error).

Anyone you think should look at this, specifically?

[rbs-jacob]

I don't know if this is why, but vmlinux-to-elf pins a specific Git commit of python-lzo. Just FYI.

[whyitfor]

@EdwardLarson , IIRC, the issue is that:

• python-lzo is a dependency of ubireader, which is not pip-installed
• python-lzo requires certain headers to be installed

If this is true, then the changes in the PR could make the pip install of ofrak possibly fail on systems without these headers.

Since python-lzo is used directly by ubireader, and not used by OFRAK, I believe you decided in #183 to install it this way.