Drop release times for CNode

It seems there were two mechanisms for assessing whether a CNode
was still in use: a refcount and a release timestamp. The latter
seems to have been there for a long time, as a safety mechanism.

However, this timer also keeps CNode objects alive for far longer
than necessary after disconnects, potentially opening up a DoS
window.

This commit removes the timestamp-based mechanism, and replaces
it with an assert(nRefCount >= 0), to verify that the refcounting
is indeed correctly working.

src/rpcnet.cpp

@@ -55,7 +55,6 @@ Value getpeerinfo(const Array& params, bool fHelp)
         obj.push_back(Pair("version", stats.nVersion));
         obj.push_back(Pair("subver", stats.strSubVer));
         obj.push_back(Pair("inbound", stats.fInbound));
-        obj.push_back(Pair("releasetime", (boost::int64_t)stats.nReleaseTime));
         obj.push_back(Pair("startingheight", stats.nStartingHeight));
         obj.push_back(Pair("banscore", stats.nMisbehavior));