tools: Keep package name consistent with module name
The new tools mechanism is great, this commit just changes the package
name for external tools from gofumpt to its own module name, to fix a
small nits from MR#4910.
Edited by Xing Xin
The new tools mechanism is great, this commit just changes the package
name for external tools from gofumpt to its own module name, to fix a
small nits from MR#4910.