run-tests: detect when hghave fails to check for a feature and fail test
hghave exitcode != 0 might mean that hghave failed to check for feature
avaibility. Detect those cases, and fail the test, instead of skipping it.
% create test repository
adding a
adding b
adding c
% churn separate directories
user1 1 ***************************************************************
% churn all
user3 3 ***************************************************************
user1 3 ***************************************************************
user2 2 ******************************************
% churn up to rev 2
user2 2 ***************************************************************
user1 1 *******************************
% churn with aliases
alias3 3 **************************************************************
alias1 3 **************************************************************
user2 2 *****************************************
% churn with column specifier
user3 3 ***********************
user1 3 ***********************
user2 2 ***************
% churn by hour
06 1 ****************
09 2 *********************************
12 4 ******************************************************************
13 1 ****************