BLD/TST: @network, inspect formatted expection rather then str(e)
Revert "TST: skip the get_quote_stringlist in TestYahoo....failing from network issues too much"

This reverts commit 0c938e600f5aaecc565ca945037dd8ef7160cf05.
Merge pull request #6192 from y-p/PR_network

BLD/TST: @network, inspect formatted expection rather then str(e)