Add cli flag for specifying bundle mode

[dtheyer]

Bundle mode is much faster, but can break in some edgecases. Allowing a cli arg to override the config value makes it easier for developers to disable it for one-off tests which require standard mode.

With bundle mode set to :compatible mode in my config, both bundle and standard uploads are done:

[dtheyer@devvm25808.prn0:tt2]$ /opt/chef-workstation/embedded/bin/ruby ~/tt2/bin/taste-tester upload 
Loading plugin at /etc/taste-tester/hooks/prod-hooks.rb
Starting taste-tester server
Using /home/dtheyer/repo
Doing full upload
Creating bundle...
Running bundle upload
Uploading cookbooks...
Uploading roles...
Uploading databags...

When I set bundle mode to true:

/opt/chef-workstation/embedded/bin/ruby ~/tt2/bin/taste-tester upload -b true
Loading plugin at /etc/taste-tester/hooks/prod-hooks.rb
Using /home/dtheyer/opsfiles
Doing full upload
Creating bundle...
Running bundle upload

When set to false:

/opt/chef-workstation/embedded/bin/ruby ~/tt2/bin/taste-tester upload -b false
Loading plugin at /etc/taste-tester/hooks/prod-hooks.rb
Restarting taste-tester server for config change
Using /home/dtheyer/opsfiles
Doing full upload
Uploading cookbooks...
Uploading roles...
Uploading databags...

When set to compatible

/opt/chef-workstation/embedded/bin/ruby ~/tt2/bin/taste-tester upload -b compatible --skip-repo-checks
Loading plugin at /etc/taste-tester/hooks/prod-hooks.rb
Restarting taste-tester server for config change
Using /home/dtheyer/opsfiles
Doing full upload
Creating bundle...
Running bundle upload
Uploading cookbooks...
...