* epoch: misc fixes and logging
* blob: misc helpers
* cli: removed useless 'repository upgrade', replaced by 'repository set-parameters'
* content: implemented indexBlobManagerV1 which uses epoch manager
* cli: commands to manipulate repository epoch parameters
* cli: commands to examine epoch-based indexes
* content: added test suite that uses epoch-based index manager
* content: fixed a ton of test data races caused by sharing blobtesting.DataMap
* cli: additional tests and validation for 'repository set-params'
* testing: replaced the use of suite with our own, since suite is not parallelizable
