Functional tests are failing nightly on Linux

[rchiodo]

AssertionError [ERR_ASSERTION]:

'module' object has no attribute 'read'

does not contain pd has no attribute 'read'
at verifyHtmlOnLastCell (src/test/datascience/history.functional.test.tsx:178:16)
at Object. (src/test/datascience/history.functional.test.tsx:271:9)
at Generator.next ()
at fulfilled (out/test/datascience/history.functional.test.js:6:58)
at

And

AssertionError: Non cancellation error found : AssertionError: Cancel did not cancel getusable after 10ms: expected false to be truthy
at /home/vsts/work/1/s/src/test/datascience/notebook.functional.test.ts:425:20
at Generator.next ()
at fulfilled (out/test/datascience/notebook.functional.test.js:6:58)
at
at process._tickCallback (internal/process/next_tick.js:188:7): expected false to be truthy
at /home/vsts/work/1/s/src/test/datascience/notebook.functional.test.ts:428:20
at Generator.next ()
at fulfilled (out/test/datascience/notebook.functional.test.js:6:58)
at
at process._tickCallback (internal/process/next_tick.js:188:7)