Fix return value of randomEntries for HRANDFIELD when count is negative

[BalaKaza]

Expected behavior

randomEntries(H key, long count) should return the count equivalent entries in case of a negative (absolute value of count) or a positive count value.

Actual behavior

randomEntries(H key, long count) currently returns a Map<HK, HV> which does not account for the duplicates that can be returned(https://redis.io/commands/hrandfield/) when a negative count is given. This results in an inaccurate number (less than the count) of random entries being returned when there is a negative count.

Steps to reproduce:

Create a Hash Set with size 5
Call random entries(H key, long count); with a count of -3.
Assert for the size of the result.

[mp911de]

This limitation is a deliberate design choice of the original ticket as the API would have required two methods or an inconvenient return type that would not allow map lookups. If you want to obtain non-distinct map entries, please use the hRandFieldWithValues(…) method on RedisConnection directly.