Unfortunately, some code in edx-platform is imported
relative to sub-projects instead of the repository root.
The only three remaining instances of this are:
* common/lib/xmodule/xmodule (imported as just 'xmodule')
* common/lib/capa/capa (imported as just 'capa')
* openedx/core/lib/xblock_builtin/xblock_discussion
(imported as just 'xblock_discussion')
For more details on the situation, see:
https://openedx.atlassian.net/browse/BOM-2579
(public, but requires Atlassian account creation).
We would like to get to a point where all edx-platform
import paths match their folder paths, relative to the repo
root. For now, though, all common/lib/capa and common/lib/xmodule
code should be imported as just `from capa` and `from xmodule`,
respectively. Importing using the full `common.lib.xmodule.xmodule...`
path will often work, but it instantiates a second instance of all
modules imported this way, which in the past has led to very
difficult-to-diagnose bugs. It also confuses tooling such as
import-linter, which we are trying to add to edx-platform
(see https://openedx.atlassian.net/browse/BOM-2576)
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