`staticcheck` is a golang code analysis tool. https://staticcheck.io/
This commit fixes a lot of problems found in our code. Common problems are:
- unnecessary use of fmt.Sprintf
- duplicated imports with different names
- unnecessary check that a key exists before a delete call
There are still a lot of reported problems in the test files but I have
not looked at those.
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
8452b768ec