[kirkstone] pkgfeed-ni-extra: remove python3-pysnmp

[amstewart]

packagefeed-ni-extra currently throws an error during the bitbake recipe parsing stage like so.

ERROR: Nothing RPROVIDES 'python3-pycrypto' (but /home/usr0/fast/nilrt-kirkstone/sources/meta-cloud-services/meta-openstack/recipes-devtools/python/python3-pysnmp_4.4.12.bb RDEPENDS on or otherwise requires it)
NOTE: Runtime target 'python3-pycrypto' is unbuildable, removing...
Missing or unbuildable dependency chain was: ['python3-pycrypto']
NOTE: Runtime target 'python3-pysnmp' is unbuildable, removing...
Missing or unbuildable dependency chain was: ['python3-pysnmp', 'python3-pycrypto']
ERROR: Required build target 'packagefeed-ni-extra' has no buildable providers.
Missing or unbuildable dependency chain was: ['packagefeed-ni-extra', 'python3-pysnmp', 'python3-pycrypto']

The python3-pysnmp module depends on the pycrpto module - which has been removed from upstream OE-core and meta-nilrt as of kirkstone. pysnmp is therefore unbuildable.

pysnmp was apparently added to the extra/ feed back in fido, with no justification. So it is being removed without consideration.

Remove python3-pysnmp from the extras/ feed.

NI AZDO 2461734

Testing

• With this patchset in place, the above error is no longer being emitted, and the build proceeds through to processing the extras/ feed recipes.
• No other recipes in the solution seem to depend upon pycrypto. Though there are other recipes in the meta-cloud-services layer which might trigger the same error in the future.