Fix EVA Configuration

[LordDarkula]

I was getting periodic nondeterministic test failures due to how broken the paths are on system setup.

Use pathlib library for calculating paths when starting eva_server

Building paths by appending strings is error-prone and will not work on other platforms. Python pathlib takes
care of that automatically.

Remove Python reference to python gettempdir() in bootstrap_environment

On ada-01, I do not have permission to access /tmp, so no matter what I do, the unit tests will fail periodically and need to be fixed. Since eva already creates a ~/.eva/ directory we can use /.eva/tmp as a temporary directory and clean it up in the cleanup script.

EVA_UPLOAD_DIR in dictionary.py was also unused previously which caused confusion.

[jarulraj]

Important change. Is it to possible to quickly check for other hard-coded paths?

[LordDarkula]

Important change. Is it to possible to quickly check for other hard-coded paths?

There are a couple instances of hard-coded paths used in tests, but they are all used with Mocks so changing them is not really necessary. I could not find any other instances of hard-coded paths. Maybe @gaurav274 can help me on this.

[jarulraj]

We should mock the local dev environment in a test case (that is why coverage is dropping a bit). Otherwise, LGTM.