The same cache store should't be added multiple times to the cache st…

…ores list (adobe-apiplatform#8)

* request_caching only reads from memory
* added remoteCacheStatus class for retrieving a healthy Redis backend
* updated the test with docker to figure out a possible IP for the Redis docker container
* updated Makefile to only clean the Redis docker instances when running tests
* Updated `make install` with the new folder `status`
* The same cache store should't be added multiple times to the cache stores list
* Updated log message after suggestions from review

Added Remote Cache Status class to obtain the first healthy redis nod…

…e from an upstream (adobe-apiplatform#7)

[adobe-apiplatform#7] Added Remote Cache Status class to obtain the first healthy redis node from an upstream

[ADDEUM] typo fix in `make install`