Implements Client-Side RowKey translation on import

[yuce]

• Requires Pilosa compiled from: Added /internal/translate/keys endpoint featurebase#1751
• Currently works for RowKeyColumnID type data
• It works on roaring import.
• It works on CSV import. Temporarily disabled that though, since it requires ignoreKeyCheck flag; unconditionally enabling it breaks some tests, so need to look into that.
• Although not enabled currently, it should be easy to implement it for RowIDColumnKey and RowKeyColumnKey type data.
• Value fields are not supported yet, but should be trivial to implement.

[coveralls]

Coverage decreased (-1.1%) to 98.621% when pulling 7e16d5d on yuce:row-keys-to-id-mapper into 4f922ff on pilosa:master.

[coveralls]

Coverage decreased (-1.2%) to 98.077% when pulling 55649f6 on yuce:row-keys-to-id-mapper into 3aaa205 on pilosa:master.