~samwhited/checkdoc

checkdoc: fix generated code detection and flag

Signed-off-by: Sam Whited <sam@samwhited.com>
checkdoc: skip generated files in header check

Signed-off-by: Sam Whited <sam@samwhited.com>
checkdoc: fix panic when file has no comments
checkdoc: skip checking files in cache

Signed-off-by: Sam Whited <sam@samwhited.com>
checkdoc: add check for file header comments

Signed-off-by: Sam Whited <sam@samwhited.com>
checkdoc: mention canonical import check in readme
checkdoc: skip checks for _test and main packages
checkdoc: add check for canonical import comment
checkdoc: fix license link in readme
checkdoc: new tool to check for package level docs