[mnemosyne] Pushed x86 stabilisation back 45 days

Waiting on upstream to stabilise kid.
[rdial] Pushed amd64 stabilisation back 45 days

Waiting on upstream to stabilise cov-core.
[flake8] Pushed amd64 stabilisation back 45 days

Waiting on upstream to stabilise usable pyflakes.
[pytrainer] Pushed amd64 stabilisation back 60 days

Waiting on upstream to stabilise usable matplotlib.
[nose2] 0.4.6 keyworded amd64

Package-Manager: portage-2.1.12.2
Manifest-Sign-Key: C0174749
Update metadata cache for upstream's eclass changes