test: use generaldelta for test-bundle.t This impacts tests of the 'packed' feature. We can safely accept the new output because the 'v1' format is not restricted to old revlog format, the requirements are properly advertised to the client.

test: use generaldelta in 'test-rebase-conflict.t' Doing this has some minor impacts on test output since the rebase backup bundle moves to bundle2.

tests: test generaldelta configuration in test-init.t We turn the feature on for the whole test and test that it can properly be disabled through the config.