Upgrade to redispy 4.1.3 (min python 3.6)

[MeirShpilraien]

Moved to redispy 4.1.3 and add tls-passphrase option

• Require this fix on redispy : Fix flushdb and flushall redis/redis-py#1926

The PR changes minimum python supported version to 3.6

[chayim]

Small suggestions. Great PR - surgical.

[lgtm-com]

This pull request fixes 1 alert when merging fb1e7f2 into 83f2327 - view on LGTM.com

fixed alerts:

• 1 for Unused import

[lgtm-com]

This pull request fixes 1 alert when merging 801d805 into 83f2327 - view on LGTM.com

fixed alerts:

• 1 for Unused import

[codecov-commenter]

Codecov Report

Merging #154 (85a371c) into master (83f2327) will decrease coverage by 2.53%.
The diff coverage is 65.00%.

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
- Coverage   36.66%   34.13%   -2.54%     
==========================================
  Files          17       17              
  Lines        2168     2171       +3     
==========================================
- Hits          795      741      -54     
- Misses       1373     1430      +57     

Flag	Coverage Δ
unittests	34.13% <65.00%> (-2.54%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
RLTest/__main__.py	0.00% <0.00%> (ø)
RLTest/redis_enterprise_cluster.py	26.43% <ø> (-0.84%)	⬇️
RLTest/redis_std.py	63.36% <66.66%> (+0.02%)	⬆️
RLTest/redis_cluster.py	72.54% <69.23%> (+2.87%)	⬆️
RLTest/env.py	57.44% <100.00%> (+0.11%)	⬆️
RLTest/Enterprise/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
RLTest/Enterprise/Dmc.py	0.00% <0.00%> (-35.49%)	⬇️
RLTest/Enterprise/EnterpriseClusterEnv.py	0.00% <0.00%> (-21.88%)	⬇️
RLTest/Enterprise/CcsMock.py	0.00% <0.00%> (-16.52%)	⬇️

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[lgtm-com]

This pull request fixes 1 alert when merging 0ce559a into 83f2327 - view on LGTM.com

fixed alerts:

• 1 for Unused import

[lgtm-com]

This pull request fixes 1 alert when merging 85a371c into 83f2327 - view on LGTM.com

fixed alerts:

• 1 for Unused import