pypi.bbclass: Update the upstream checks to automatically replace '_' with '-'

pypi.bbclass: Update the upstream checks to automatically replace '_' with '-'

For a number of existing packages, the pypi URI contains '-', but the package name (PYPI_PACKAGE) uses '_'.  Add a simple replace for the UPSTREAM_CHECK_URI and UPSTREAM_CHECK_REGEX.  The change resulted in 19 additional auto-detected upstream checks for python packages meta-python.

It did break upstream checks for 3 packages that will be patched shortly:
 - python3-ipython-genutils
 - python3-ninja-syntax
 - python3-wpa-supplicant

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>