dmtest should create ~/.dmtest/log and ~/.dmtest/reports directories automatically

[simonxuhao]

dmtest should create ~/.dmtest/log and ~/.dmtest/reports directories automatically, it can be pretty confusing for new users.

$ dmtest run --suite thin-provisioning -t BasicTests
Loaded suite thin-provisioning
BasicTests
  dd_benchmark...PASS
  ext4_weirdness...PASS
  overwriting_various_thin_devices...PASS
  pool_without_thin_devices_does_not_commit...PASS
  test_overwrite_a_linear_device...PASS
No such file or directory @ rb_sysopen - /root/.dmtest/reports/BasicTests__dd_benchmark.html
/root/devel/device-mapper-test-suite/lib/dmtest/report-generators/report_templates.rb:63:in `initialize'
/root/devel/device-mapper-test-suite/lib/dmtest/report-generators/report_templates.rb:63:in `open'
/root/devel/device-mapper-test-suite/lib/dmtest/report-generators/report_templates.rb:63:in `open'
/root/devel/device-mapper-test-suite/lib/dmtest/report-generators/report_templates.rb:63:in `generate_report'
/root/devel/device-mapper-test-suite/lib/dmtest/report-generators/report_templates.rb:32:in `unit_detail'
/root/devel/device-mapper-test-suite/bin/dmtest:425:in `block in generate'
/root/devel/device-mapper-test-suite/bin/dmtest:421:in `glob'
/root/devel/device-mapper-test-suite/bin/dmtest:421:in `generate'
/root/devel/device-mapper-test-suite/bin/dmtest:388:in `run'
/usr/local/rvm/gems/ruby-2.5.3/gems/ejt_command_line-0.0.4/lib/ejt_command_line.rb:178:in `parse'
/root/devel/device-mapper-test-suite/bin/dmtest:646:in `block in <top (required)>'
/root/devel/device-mapper-test-suite/bin/dmtest:632:in `top_level_handler'
/root/devel/device-mapper-test-suite/bin/dmtest:644:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.5.3/bin/dmtest:23:in `load'
/usr/local/rvm/gems/ruby-2.5.3/bin/dmtest:23:in `<main>'
/usr/local/rvm/gems/ruby-2.5.3/bin/ruby_executable_hooks:24:in `eval'
/usr/local/rvm/gems/ruby-2.5.3/bin/ruby_executable_hooks:24:in `<main>'

$ dmtest run --suite thin-provisioning -t BasicTests -n /dd/
Loaded suite thin-provisioning
BasicTests
No such file or directory @ rb_sysopen - /root/.dmtest/log/BasicTests_dd_benchmark.log
/root/devel/device-mapper-test-suite/bin/dmtest:274:in `initialize'
/root/devel/device-mapper-test-suite/bin/dmtest:274:in `open'
/root/devel/device-mapper-test-suite/bin/dmtest:274:in `test_started'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/util/observable.rb:78:in `block in notify_listeners'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/util/observable.rb:78:in `each'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/util/observable.rb:78:in `notify_listeners'
/root/devel/device-mapper-test-suite/bin/dmtest:132:in `block in run_suite'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testcase.rb:74:in `run'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testsuite.rb:34:in `block in run'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testsuite.rb:33:in `each'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testsuite.rb:33:in `run'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testsuite.rb:34:in `block in run'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testsuite.rb:33:in `each'
/usr/local/rvm/gems/ruby-2.5.3/gems/test-unit-1.2.3/lib/test/unit/testsuite.rb:33:in `run'
/root/devel/device-mapper-test-suite/bin/dmtest:131:in `run_suite'
/root/devel/device-mapper-test-suite/bin/dmtest:215:in `start_mediator'
/root/devel/device-mapper-test-suite/bin/dmtest:181:in `start'
/root/devel/device-mapper-test-suite/bin/dmtest:386:in `run'
/usr/local/rvm/gems/ruby-2.5.3/gems/ejt_command_line-0.0.4/lib/ejt_command_line.rb:178:in `parse'
/root/devel/device-mapper-test-suite/bin/dmtest:646:in `block in <top (required)>'
/root/devel/device-mapper-test-suite/bin/dmtest:632:in `top_level_handler'
/root/devel/device-mapper-test-suite/bin/dmtest:644:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.5.3/bin/dmtest:23:in `load'
/usr/local/rvm/gems/ruby-2.5.3/bin/dmtest:23:in `<main>'
/usr/local/rvm/gems/ruby-2.5.3/bin/ruby_executable_hooks:24:in `eval'
/usr/local/rvm/gems/ruby-2.5.3/bin/ruby_executable_hooks:24:in `<main>'