conf: make virDomainNetDefFormat a public function

We will need to call virDomainNetDefFormat() from the network hook (in
the network driver).

src/conf/domain_conf.c

@@ -15504,7 +15504,7 @@ virDomainActualNetDefFormat(virBufferPtr buf,
     return 0;
 }
 
-static int
+int
 virDomainNetDefFormat(virBufferPtr buf,
                       virDomainNetDefPtr def,
                       unsigned int flags)

src/conf/domain_conf.h

@@ -2402,6 +2402,10 @@ int virDomainDiskSourceDefFormatInternal(virBufferPtr buf,
                                          virDomainDiskSourcePoolDefPtr srcpool,
                                          unsigned int flags);
 
+int virDomainNetDefFormat(virBufferPtr buf,
+                          virDomainNetDefPtr def,
+                          unsigned int flags);
+
 int virDomainDefCompatibleDevice(virDomainDefPtr def,
                                  virDomainDeviceDefPtr dev);
 

src/libvirt_private.syms

@@ -300,6 +300,7 @@ virDomainMemballoonModelTypeFromString;
 virDomainMemballoonModelTypeToString;
 virDomainMemDumpTypeFromString;
 virDomainMemDumpTypeToString;
+virDomainNetDefFormat;
 virDomainNetDefFree;
 virDomainNetFind;
 virDomainNetFindIdx;