remove conftest sys.path hack, fixes #1072

not needed any more as the code is now below src/.

conftest.py

@@ -1,24 +1,3 @@
-import sys
-
-# This is a hack to fix path problems because "borg" (the package) is in the source root.
-# When importing the conftest an "import borg" can incorrectly import the borg from the
-# source root instead of the one installed in the environment.
-# The workaround is to remove entries pointing there from the path and check whether "borg"
-# is still importable. If it is not, then it has not been installed in the environment
-# and the entries are put back.
-#
-# TODO: After moving the package to src/: remove this.
-
-original_path = list(sys.path)
-for entry in original_path:
-    if entry == '' or entry.endswith('/borg'):
-        sys.path.remove(entry)
-
-try:
-    import borg
-except ImportError:
-    sys.path = original_path
-
 from borg.logger import setup_logging
 
 # Ensure that the loggers exist for all tests