client: Handle orphaned Operations

Allow Operation instances to outlive
the Context through which they were
created.

test/testmon.cpp

@@ -48,7 +48,7 @@ struct BasicTest {
 
     ~BasicTest()
     {
-        if(cli.use_count()!=1u)
+        if(cli.use_count()>1u)
             testAbort("Tester Context leak");
     }
 
@@ -84,6 +84,17 @@ struct BasicTest {
         }
         return ret;
     }
+
+    void orphan()
+    {
+        testShow()<<__func__;
+
+        auto op = cli.monitor("nonexistent").exec();
+
+        // clear Context to orphan in-progress operation
+        cli = client::Context();
+        op.reset();
+    }
 };
 
 struct TestLifeCycle : public BasicTest
@@ -253,6 +264,7 @@ MAIN(testmon)
     testPlan(22);
     testSetup();
     logger_config_env();
+    BasicTest().orphan();
     TestLifeCycle().testBasic(true);
     TestLifeCycle().testBasic(false);
     TestLifeCycle().testSecond();