Ignore trailing slash in DSN

[HypeMC]

Currently the DSN doesn't work if you have an optional db, eg:

snc_redis:
  clients:
    default:
      dsn: '%env(REDIS_DSN)%/%env(default::REDIS_DB)%'

[ostrolucky]

I'm sorry but this would be quite inconsistent with other projects. AFAIK no project is doing this. If you have optional database, you can either include it in DSN, or combine dsn with specific parameters like so

snc_redis:
  clients:
    default:
      dsn: '%env(REDIS_DSN)%'
      options:
        parameters:
          database: '%env(default::REDIS_DB)%'

[HypeMC]

@ostrolucky Actually, it works with eg Symfony's lock component:

framework:
  lock:
    resources:
      default: '%env(REDIS_DSN)%/%env(default::REDIS_DB)%'

In any case, there are some examples that need to be fixed then, eg https://github.com/snc/SncRedisBundle/tree/master/docs#usage-with-symfonyweb-profiler-bundle