Handle shutdown for RedisCacheAdapter

[promisenxu]

Call handleShutdown of RedisCacheAdapter in the handleShutdown part of Parse Server

[codecov]

Codecov Report

Merging #6658 into master will increase coverage by 10.14%.
The diff coverage is 80.76%.

@@             Coverage Diff             @@
##           master    #6658       +/-   ##
===========================================
+ Coverage   83.73%   93.88%   +10.14%     
===========================================
  Files         169      169               
  Lines       11997    12007       +10     
===========================================
+ Hits        10046    11273     +1227     
+ Misses       1951      734     -1217     

Impacted Files	Coverage Δ
src/ParseServer.js	89.47% <62.50%> (-1.60%)	⬇️
src/Adapters/Cache/RedisCacheAdapter/index.js	94.64% <88.88%> (-3.32%)	⬇️
src/RestWrite.js	93.67% <0.00%> (ø)
src/Routers/UsersRouter.js	94.33% <0.00%> (+0.62%)	⬆️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	93.52% <0.00%> (+0.66%)	⬆️
src/Controllers/UserController.js	94.39% <0.00%> (+0.93%)	⬆️
src/Controllers/FilesController.js	93.61% <0.00%> (+2.12%)	⬆️
src/Adapters/Storage/Postgres/PostgresClient.js	86.66% <0.00%> (+80.00%)	⬆️
...dapters/Storage/Postgres/PostgresStorageAdapter.js	96.33% <0.00%> (+93.84%)	⬆️

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[davimacedo]

Thanks for the PR. LGTM!

[promisenxu]

Thanks! My first-ever pull request on GitHub!