test-merge-subrepos: make test compatible with chg
The test checks the output of '.hg/blackbox.log' which will contain
logs corresponding to chg in case chg is running. Therefore, this commit
modifies the test to take chg into consideration while checking the
blackbox.log contents.
Test Plan:
Ran the test 'test-merge-subrepos.t' with and without the '--chg'
option.
Differential Revision: https://phab.mercurial-scm.org/D925
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
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