Fix FeatureCacheProviderRedis

[bhanushe]

Currently, the constructor for FeatureCacheProviderRedis accepts 2 parameters but uses defaults while creating new Jedis object.

public FeatureCacheProviderRedis(String host, int port) {
    jedis = new Jedis(redisHost, redisport);
}

Kindly update the constructor to use the parameters.

The method below uses a prefix to search for cache keys.

@Override
public Set<String> listCachedFeatureNames() {
    return jedis.keys(PREFIX_KEY + "*");
}

I believe the presence of the prefix "PREFIX_KEY" may be an error. The "put" method does not use the prefix to cache the feature. Hence this method returns empty set unless it is backed by a Redis feature store (which is not correct, as in that case it return the actual feature rather than the cached feature)

[clun]

Your were right in both cases.

The constructor is now corrected.

I committed a "new" jcache store which lead to a bit of changes in all caches. (Unfortunately Redis is not yet compliant with JCache). Anyway I kept the prefix everywhere to be able to distinct features and properties.