Rake task to print out checksum of repositories and their replicas

We need a rake task that calls gitaly#2082 (closed) for all repositories and prints out a table with the primary checksum and the replica checksums. Sys admins can use this rake task to see if there are any repositories that are not up to date.

rake gitlab:praefect:replicas:all

Project Name	primary checksum	replica 1 checksum	replica 2 checksum
gitlab	f83405d4f34c45676a4cfd023ea419645036694b	f83405d4f34c45676a4cfd023ea419645036694b	f83405d4f34c45676a4cfd023ea419645036694b
gitaly	54fae685e0f8e7236af72cd5fe8499ed21ce5f3b	54fae685e0f8e7236af72cd5fe8499ed21ce5f3b	54fae685e0f8e7236af72cd5fe8499ed21ce5f3b
my_proj1	984c929711223ae69e6da8f3cb75d4678d6c5f8f	d5856113f1d321f166c0f42fa24cf3aa967885b7	984c929711223ae69e6da8f3cb75d4678d6c5f8f

rake gitlab:praefect:replicas:mismatch

Project Name	primary checksum	replica 1 checksum	replica 2 checksum
my_proj1	984c929711223ae69e6da8f3cb75d4678d6c5f8f	d5856113f1d321f166c0f42fa24cf3aa967885b7	984c929711223ae69e6da8f3cb75d4678d6c5f8f