tools/run-centos: cleanups and move to using read-dependencies

These changes are all in an effort to get tools/run-centos using
read-dependencies rather than the 'setup-centos' script with a separate
set of dependencies listed.

 - tools/read-dependencies: support taking multiple --requirements
   options.  This allows run-centos to get both test and build
   dependencies.  Ultimately, I think it might be nicer for
   read-dependencies to take a list of "goals" (build, test, run or
   test-tox) rather than having the caller need to know to provide
   multiple --requirements.

 - packages/pkg-deps.json: drop the version on the sudo package.
   centos 6 has newer (1.8.6p3) version than listed, so its not a problem.

 - test_handler_disk_setup.py: a test case here was using assertLogs
   which is not present in the version of unittest2 that is available in
   centos 6 epel. We just adjust it to use with_logs = True.

 - tools/run-cents:
   - improve usage with example
   - add 'inside_as_cd' to provide the dir you want to cd first to.
   - avoid the intermediate tarball on disk in the container.
   - add 'prep' subcommand and use it to install pre-dependencies.
   - use read-dependencies.

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