* testenv/Test-metalink-http.py: Use python .replace
* testenv/Test-metalink-xml.py: Use python .replace
* testenv/Test-metalink-xml-abspath.py: Use python .replace
* testenv/Test-metalink-xml-relpath.py: Use python .replace
Use python .replace instead than re.sub, remove 'import re'.
* testenv/test/base_test.py (__init__): Use test file name for name,
remove 'name' parameter
* testenv/test/http_test.py (__init__): Remove 'name' parameter
* testenv/*.py: Remove TEST_NAME
Using a fixed string (TEST_NAME) to build the working directory
for testing caused random failures (or successes) when tests
share the same TEST_NAME value. Not easy to find without digging
into the python test suite code.
We now use the test file name, which is unique within the test
environment.
