Erase verf key left from creation from ientries on every modification

src/nfs_kv_write.cpp

@@ -546,6 +546,7 @@ static std::string new_normal_ientry(nfs_kv_write_state *st)
     ni.erase("shared_ver");
     ni["size"] = st->ext->cur_extend;
     ni["mtime"] = nfstime_now_str();
+    ni.erase("verf");
     return json11::Json(ni).dump();
 }
 
@@ -559,6 +560,7 @@ static std::string new_moved_ientry(nfs_kv_write_state *st)
     ni.erase("shared_ver");
     ni["size"] = st->new_size;
     ni["mtime"] = nfstime_now_str();
+    ni.erase("verf");
     return json11::Json(ni).dump();
 }
 
@@ -569,6 +571,7 @@ static std::string new_shared_ientry(nfs_kv_write_state *st)
     ni["size"] = st->new_size;
     ni["mtime"] = nfstime_now_str();
     ni["shared_ver"] = ni["shared_ver"].uint64_value()+1;
+    ni.erase("verf");
     return json11::Json(ni).dump();
 }
 
@@ -581,6 +584,7 @@ static std::string new_unshared_ientry(nfs_kv_write_state *st)
     ni.erase("shared_alloc");
     ni.erase("shared_ver");
     ni["mtime"] = nfstime_now_str();
+    ni.erase("verf");
     return json11::Json(ni).dump();
 }