tests: clean up includes

After removing qemuBuildCommandLineCallbacks, testutilsqemu.h does not
need to include qemu_command.h.

Include just qemu_conf.h here and qemu_domain_address.h in files that
need it.

tests/qemuxml2xmltest.c

@@ -13,7 +13,7 @@
 #ifdef WITH_QEMU
 
 # include "internal.h"
-# include "qemu/qemu_conf.h"
+# include "qemu/qemu_domain_address.h"
 # include "qemu/qemu_domain.h"
 # include "testutilsqemu.h"
 # include "virstring.h"

tests/testutilsqemu.h

@@ -2,8 +2,8 @@
 
 # include "capabilities.h"
 # include "domain_conf.h"
-# include "qemu/qemu_command.h"
 # include "qemu/qemu_capabilities.h"
+# include "qemu/qemu_conf.h"
 
 virCapsPtr testQemuCapsInit(void);
 virDomainXMLOptionPtr testQemuXMLConfInit(void);