Refs #10961. Add missing RunProlog()/RunEpilog()

I don't know if this addresses the issue of the ticket or not
but this should address the warnings about DB connection handling
in #10934 which may be related. FYI The QRunnable::run()
implementations don't need this as calling this is handled
by MThreadPool for those.

mythtv/libs/libmythtv/HLS/httplivestreambuffer.cpp

@@ -1024,6 +1024,8 @@ class StreamWorker : public MThread
 protected:
     void run(void)
     {
+        RunProlog();
+
         int retries = 0;
         while (!m_interrupted)
         {
@@ -1121,6 +1123,8 @@ class StreamWorker : public MThread
             // Signal we're done
             Wakeup();
         }
+
+        RunEpilog();
     }
 
     int BandwidthAdaptation(int progid, uint64_t &bandwidth)
@@ -1210,6 +1214,8 @@ class PlaylistWorker : public MThread
 protected:
     void run(void)
     {
+        RunProlog();
+
         double wait = 0.5;
         double factor = m_parent->GetCurrentStream()->Live() ? 1.0 : 2.0;
 
@@ -1288,6 +1294,8 @@ class PlaylistWorker : public MThread
             m_wakeup = ((int64_t)(hls->TargetDuration() * wait * factor)
                         * (int64_t)1000);
         }
+
+        RunEpilog();
     }
 
 private: