ping_on_startup ignored

When a configuration property
infinispan.client.hotrod.ping_on_startup=false
is passed to the properties of RemoteCacheManager, this
avoids ping in RemoteCacheManager.start() but
RemoteCacheManager.getCache() does ping without checking this property
and thus rendering this setting useless for scenario

where we want to specify
infinispan.client.hotrod.server_list

with list of servers with some of the servers possibly not available yet.
In such case we would expect the client to failover to first working server
and retrying the first operation we want to do with the cache.