Fix: Projects created outside of Gerrit could not be cloned.

The commit:

  cd94b4b7a381527f9bd216ffc7b7b3180075d16f
  "Fix case check for project name so that symlinks work again"

...introduced an issue where projects created directly on FS
could not be cloned. Effectively rendering new and replicated
projects unreachable from gerrit slaves before flushing the
projects_list cache and rescanning the filesystem through ssh
command "ls-project".

A new check is introduced in this patch, allowing projects to
be read from FS if they are not found in the names-cache.

Change-Id: Iab33b4480179792c1f151e53fc8d037721f01264
1 file changed