bytevector: don't deadlock on operator<<

operator<< was a friend class that locked the ByteVector, then invoked
hexdump on the bytevector, which used ByteVector::operator[]...which
locked the ByteVector, resulting in a deadlock.

operator<< shouldn't be a friend class anyway.  Make hexdump use the
normal public access methods for ByteVector.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

lib/bytevector.cc

@@ -183,7 +183,6 @@ namespace crucible {
 
 	ostream&
 	operator<<(ostream &os, const ByteVector &bv) {
-		unique_lock<mutex> lock(bv.m_mutex);
 		hexdump(os, bv);
 		return os;
 	}