Prefer pos-bol and pos-eol in tests

Prefer pos-bol and pos-eol in tests

* test/lisp/calendar/todo-mode-tests.el
(todo-test-toggle-item-header02, todo-test-edit-item-date-month)
(todo-test-multiline-item-indentation-1)
(todo-test-multiline-item-indentation-2)
(todo-test-multiline-item-indentation-3):
* test/lisp/cedet/semantic-utest-ia.el (semantic-ia-utest-buffer)
(semantic-sr-utest-buffer-refs):
* test/lisp/cedet/semantic-utest.el (semantic-utest-kill-indicator)
(semantic-utest-unkill-indicator):
* test/lisp/dired-tests.el (dired-test-bug27968):
* test/lisp/emacs-lisp/backtrace-tests.el
(backtrace-tests--verify-single-and-multi-line):
* test/lisp/emacs-lisp/find-func-tests.el
(find-func-tests--find-library-verbose):
* test/lisp/erc/erc-tests.el (erc-ring-previous-command)
(erc-log-irc-protocol):
* test/lisp/gnus/message-tests.el (message-mode-propertize):
* test/lisp/info-xref-tests.el (info-xref-test-emacs-manuals):
* test/lisp/mail/footnote-tests.el (footnote-tests-same-place):
* test/lisp/progmodes/elisp-mode-tests.el
(elisp-shorthand-completion-at-point):
* test/lisp/progmodes/f90-tests.el (f90-test-bug38415):
* test/lisp/progmodes/python-tests.el
(python-indent-electric-comma-inside-multiline-string)
(python-indent-electric-comma-after-multiline-string)
(python-indent-electric-colon-1, python-indent-electric-colon-2)
(python-indent-electric-colon-3, python-indent-electric-colon-4)
(python-mark-defun-2, python-mark-defun-3, python-mark-defun-4)
(python-mark-defun-5, python-nav-end-of-defun-2)
(python-nav-end-of-statement-1, python-nav-end-of-block-1)
(python-indent-dedent-line-backspace-2)
(python-indent-dedent-line-backspace-3)
(python-eldoc--get-symbol-at-point-1)
(python-info-beginning-of-statement-p-1)
(python-info-beginning-of-statement-p-2):
* test/lisp/replace-tests.el (replace-occur-revert-bug32543)
(replace-occur-revert-bug32987):
* test/lisp/simple-tests.el (simple-delete-indentation-boundaries)
(simple-delete-indentation-region)
(line-number-at-pos-in-narrow-buffer)
(line-number-at-pos-keeps-restriction):
* test/lisp/textmodes/css-mode-tests.el (css-mode-test-selectors)
(scss-mode-test-selectors):
* test/lisp/textmodes/fill-tests.el (fill-test-unbreakable-paragraph)
(fill-test-breakable-paragraph):
* test/lisp/time-stamp-tests.el (time-stamp-custom-pattern):
* test/src/lread-tests.el (lread-tests--last-message):
* test/src/process-tests.el (set-process-filter-t):
* test/src/undo-tests.el (undo-test-skip-invalidated-markers): Prefer
pos-bol and pos-eol.