Merge branch 'jk/maint-clone-shared-no-connectivity-validation'

"git clone -s/-l" is a filesystem level copy and does not offer any protection against source repository being corrupt. While the connectivity validation checks commits and trees being readable, it made the otherwise instantaneous local modes of clone much more expensive, without protecting blob data from bitflips. * jk/maint-clone-shared-no-connectivity-validation: clone: drop connectivity check for local clones