Warn users about using `bin/accountadmin` for first time setup

Summary: The "easy setup" is sort of an exaggeration since it basically just amounts to getting you logged in correctly, but it will probably be more true in the future.

Test Plan: Ran `bin/accountadmin` with zero and more than zero accounts.

Reviewers: asherkin, btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7678
Handle "-p port" flag in ssh-connect

Summary:
The documentation is explicit that Git does not pass this flag:

  The $GIT_SSH command will be given exactly two arguments: the username@host (or just host) from the URL and the shell command to execute on that remote system.

This isn't true; it does. Accommodate it.

I'll see if I can fix this in the upstream, too.

Test Plan: Ran various `ssh-connect` commands with -p, etc.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7680
Shorten extremely long credential names when migrating them

Summary: Fixes T4183. If you have too many repositories sharing the same credential and MySQL is in strict mode, we'll fail a query when trying to write a credential with a name longer than 255 characters. Instead, shorten the variable-length part to 128 characters.

Test Plan: Wiped credentials column and successfully re-ran migration with `storage upgrade --force --apply phabricator:20131121.repocredentials.2.mig.php`

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4183

Differential Revision: https://secure.phabricator.com/D7677
Install pre-commit hooks in Git repositories

Summary:
Ref T4189. T4189 describes most of the intent here:

  - When updating hosted repositories, sync a pre-commit hook into them instead of doing a `git fetch`.
  - The hook calls into Phabricator. The acting Phabricator user is sent via PHABRICATOR_USER in the environment. The active repository is sent via CLI.
  - The hook doesn't do anything useful yet; it just veifies basic parameters, does a little parsing, and exits 0 to allow the commit.

Test Plan:
  - Performed Git pushes and pulls over SSH and HTTP.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4189

Differential Revision: https://secure.phabricator.com/D7682
Support SVN pre-commit hoooks

Summary:
Ref T4189. This adds SVN support, which was a little more messy than I though. Principally, we can not use `PHABRICATOR_USER` for Subversion, because it strips away the entire environment for "security reasons".

Instead, use `--tunnel-user` plus `svnlook author` to figure out the author.

Also fix "ssh://" clone URIs, which needs to be "svn+ssh://".

Test Plan:
  - Made SVN commits through the hook.
  - Made Git commits, too, to make sure I didn't break anything.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4189

Differential Revision: https://secure.phabricator.com/D7683
Support Mercurial pretxnchangegroup hooks

Summary: Ref T4189. Fixes T2066. Mercurial has a //lot// of hooks so I'm not 100% sure this is all we need to install (we may need separate hooks for tags/bookmarks) but it should cover most of what we're after at least.

Test Plan:
  - `bin/repository pull`'d a Mercurial repo and got a hook install.
  - Pushed to a Mercurial repository over SSH and HTTP, with good/bad hooks. Saw hooks fire.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2066, T4189

Differential Revision: https://secure.phabricator.com/D7685
Restructure Drydock so that blueprints are instances in the DB

Summary:
//(this diff used to be about applying policies to blueprints)//

This restructures Drydock so that blueprints are instances in the DB, with an associated implementation class.  Thus resources now have a `blueprintPHID` instead of `blueprintClass` and DrydockBlueprint becomes a DAO.  The old DrydockBlueprint is renamed to DrydockBlueprintImplementation, and the DrydockBlueprint DAO has a `blueprintClass` column on it.

This now just implements CAN_VIEW and CAN_EDIT policies for blueprints, although they are probably not enforced in all of the places they could be.

Test Plan: Used the `create-resource` and `lease` commands.  Closed resources and leases in the UI.  Clicked around the new and old lists to make sure everything is still working.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4111, T2015

Differential Revision: https://secure.phabricator.com/D7638
Add explicit "/" when installing hooks

Summary: There's no guarantee that the local path has a trailing "/". We
should probably guarantee that at some point, but just add one
unconditionally for now.

Auditors: btrahan