Revert "avoid double work in git-annex init"

Revert "avoid double work in git-annex init"

This reverts commit 0f10f208a7c76061b7d48aaa7ea0fa8e641cace3.

The implementation of this turns out to be unsafe; it can lead to a keys
db deadlock. scanAnnexedFiles injects a call to inAnnex into
reconcileStaged, but inAnnex sometimes needs to read from the keys db,
which will try to re-open it when it's in the process of being opened.
The exclusive lock of gitAnnexKeysDbLock will then deadlock.

This needs to be done in some other way...