tests fail when run in parallel

[karenetheridge]

when HARNESS_OPTIONS=j9, tests fail:

Building and testing Test-CheckManifest-1.29
Manifying 1 pod document
PERL_DL_NONLAZY=1 "/Volumes/amaretto/Users/ether/perl5/perlbrew/perls/23.1/bin/perl5.23.1" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch')" t/*.t t/extra/*.t t/xt/*.t
t/00_load.t ........................ ok

#   Failed test 'Filter: \.(?:svn|git)'
#   at t/extra/02_test_in_subdirectory.t line 12.
#          got: 0
#     expected: 1
# The following files are not part of distro but named in the MANIFEST file: /Volumes/amaretto/Users/ether/.cpanm/work/1438910678.32720/Test-CheckManifest-1.29/t/xt/02_issue1.t
# Looks like you failed 1 test of 1.
t/extra/02_test_in_subdirectory.t .. 
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/1 subtests 
t/xt/02_issue1.t ................... ok
t/01_selftest.t .................... ok

Test Summary Report
-------------------
t/extra/02_test_in_subdirectory.t (Wstat: 256 Tests: 1 Failed: 1)
  Failed test:  1
  Non-zero exit status: 1
Files=4, Tests=12,  0 wallclock secs ( 0.03 usr  0.01 sys +  0.17 cusr  0.03 csys =  0.24 CPU)
Result: FAIL