ez: refactor based on initial feedback

Significant refactor of (formerly) "b4 submit" based on initial
feedback:

1. Split "b4 submit" into three different commands:

  - ez-series: for managing the series cover letters, tracking info, etc
  - ez-trailers: for retrieving trailers and updating commits (works on
  any branch, not just ez-series branches)
  - ez-send: for sending branches managed by ez-series

2. Refactor to support multiple cover letter strategies:

  - the default "commit" strategy that keeps the cover letter in an
  empty commit (should be backwards-compatible with "b4 submit")
  - the non-invasive "branch-description" strategy that keeps the cover
  letter in the branch.branchname.description configuration setting and
  tracking in branch.branchname.b4-tracking
  - the not-yet-implemented "tag" strategy that mimics the behaviour of
  git-publish

  The strategy can be set via b4.ez-cover-strategy variable, e.g. in
  your .gitconfig:

  [b4]
    ez-cover-strategy = branch-description

  Note, that converting from one strategy to another doesn't work and
  will probably explode in weird ways right now.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

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