* lisp/auth-source.el (auth-source-netrc-parse-one): Ensure that match
data is not overwritten in `auth-source-netrc-parse-next-interesting'.
Ensure that blanks are skipped before and after going over comments
and eols.
* test/lisp/auth-source-tests.el (auth-source-test-netrc-parse-one): New test.
(cherry picked from commit 60ff810144)
