Stop scanning rocks servers if exact match found
Stop scanning rocks servers if exact match found

The problem is described in https://github.com/tarantool/luarocks/pull/3

Based on the following patches:

- f8813b48 ('Stop scanning rocks servers if exact match found')
- 2f496703 ('Optimize repos scanning')

tarantool/luarocks,tarantool/luarocks,tarantool/luarocks