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[FIXED] Reduce memory usage on routes

When a route receives a message, it uses a thread local cache to
find the account and subscriptions match for a given subject.
When not found, an entry is added to this cache. The problem is
that this cache will reference subscriptions that in turn
reference connections.
When the subscriptions/connections are closed, this thread local
cannot be purged from those closed subscriptions (since it is
thread local - no lockin is used).
The real issue is that connection's buffer was not set to nil on
close, which then could cause more than expected memory to be
still referenced. Setting the buffer to nil will help reduce the
memory being used.
When an entry is added to the cache, the cache may reach a size
that will cause the server to prune some entries. From time to
time, the cache will be scanned to look for entries that contain
only closed subscriptions and remove those.

Resolves #1082

Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

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