Add redis cache ci tests

[lunny]

Will fix #892

[codecov-io]

Codecov Report

Merging #1112 into master will decrease coverage by 2.96%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1112      +/-   ##
==========================================
- Coverage   57.41%   54.45%   -2.97%     
==========================================
  Files          44       42       -2     
  Lines        7912     7601     -311     
==========================================
- Hits         4543     4139     -404     
- Misses       2806     2940     +134     
+ Partials      563      522      -41

Impacted Files	Coverage Δ
dialect_mssql.go	0% <0%> (-73.81%)	⬇️
cache_lru.go	53.45% <0%> (-8.18%)	⬇️
session_exist.go	57.44% <0%> (-5.52%)	⬇️
rows.go	50.76% <0%> (-5.38%)	⬇️
session_update.go	52.54% <0%> (-4.07%)	⬇️
helpers.go	57.41% <0%> (-2.32%)	⬇️
tag.go	77.09% <0%> (-2.22%)	⬇️
session_cols.go	91.3% <0%> (-2.18%)	⬇️
xorm.go	66.15% <0%> (-2.03%)	⬇️
engine_cond.go	54.96% <0%> (-1.33%)	⬇️
... and 21 more

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