[master] remove conflicting and unused 'using' directive

This should fix the issue reported by the solaris-gcc builder

diff --git a/src/lib/dhcp/tests/alloc_engine_unittest.cc b/src/lib/dhcp/tests/alloc_engine_unittest.cc
index bbb4bbd9e99a5ee937594650b8fa5a9d15409c24..8bbaf0965d0dd3009d06251bba5ce3bf23d2feff 100644 (file)
--- a/src/lib/dhcp/tests/alloc_engine_unittest.cc
+++ b/src/lib/dhcp/tests/alloc_engine_unittest.cc
@@ -30,7 +30,6 @@ using namespace isc;
 using namespace isc::asiolink;
 using namespace isc::dhcp;
 using namespace isc::dhcp::test; // Memfile_LeaseMgr
-using namespace boost;
 
 namespace {