Eas actions testing support

Summary:
Added a dumpfile: eas_dump.sql +
the option to pick which dumpfile to use (util/base.py)

Added tests/test_easactions.py

Test Plan: ./runtests passes all as expected (i.e. depending on the value of the EASTEST flag)

Reviewers: spang, emfree

CC: emfree

Differential Revision: https://review.inboxapp.com/D63