lisa.utils: Add helpers to work with docstrings
lisa.utils: Add helpers to work with docstrings

* get_short_doc(obj): returns the first paragraph of the docstring as a
one-line string

* split_paragraphs(string): Split a string into multiple paragraphs.

ARM-software/lisa,ARM-software/lisa,credp/lisa,credp/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,credp/lisa