Migrate auth-source to cl-lib

Migrate auth-source to cl-lib

* lisp/auth-source.el: Use cl-lib.
(auth-source-read-char-choice, auth-source-backend-parse-parameters):
(auth-source-search): Replace cl calls with cl-lib ones.
(auth-source-netrc-cache):
(auth-source-forget+): Use cl-do-symbols instead.
(auth-source-specmatchp, auth-source-netrc-parse):
(auth-source-netrc-search, auth-source-netrc-create):
(auth-source-netrc-saver, auth-source-secrets-listify-pattern):
(auth-source-secrets-search, auth-source-secrets-create):
(auth-source-macos-keychain-search, auth-source--decode-octal-string):
(auth-source-macos-keychain-search-items, auth-source-plstore-search):
(auth-source-plstore-create): Replace cl calls with cl-lib ones.