Support authentication through storage string for redis cluster

[alisaifee]

Description

If username/password are provided in the storage string uri for redis cluster a parsing error occurs and infact there is no provision to extract the authentication details from the string.

Related issues

• RedisCluster does not work with password in uri #153

[codecov]

Codecov Report

Base: 96.91% // Head: 96.61% // Decreases project coverage by -0.31% ⚠️

Coverage data is based on head (c06039b) compared to base (68ee7f6).
Patch coverage: 73.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
- Coverage   96.91%   96.61%   -0.31%     
==========================================
  Files          25       25              
  Lines        1168     1180      +12     
  Branches      123      127       +4     
==========================================
+ Hits         1132     1140       +8     
- Misses         18       20       +2     
- Partials       18       20       +2     

Impacted Files	Coverage Δ
limits/aio/storage/redis.py	93.79% <71.42%> (-1.18%)	⬇️
limits/storage/redis_cluster.py	95.83% <75.00%> (-4.17%)	⬇️

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