move ServerContextImpl into private header

testApp/Makefile

@@ -3,6 +3,8 @@
 TOP = ..
 include $(TOP)/configure/CONFIG
 
+USR_CPPFLAGS += -I$(TOP)/src/server/pv
+
 PVACCESS_TEST = $(TOP)/testApp
 
 PROD_LIBS += pvAccess pvData $(MBLIB) Com

testApp/remote/testServer.cpp

@@ -9,7 +9,7 @@
 // disable buggy boost enable_shared_from_this assert code
 #define BOOST_DISABLE_ASSERTS
 
-#include <pv/serverContext.h>
+#include <pv/serverContextImpl.h>
 #include <pv/clientContextImpl.h>
 #include <epicsExit.h>
 #include <pv/standardPVField.h>

testApp/remote/testServerContext.cpp

@@ -2,7 +2,7 @@
  * testServerContext.cpp
  */
 
-#include <pv/serverContext.h>
+#include <pv/serverContextImpl.h>
 #include <epicsExit.h>
 
 using namespace epics::pvAccess;