Trove does not use extras and it was removed from the top-level
requirements by 2cc36175c8dec51824c716304a7dd16c3d1038ef .
Also enum34 is no longer required because now the minimum supported
python version is 3.8 .
Change-Id: I62c04ccc3c8157a86fa8b5a307983ba0796111b0
3a69bd353b