Delete deprecated phutil_render_tag()

Test Plan: Searched for it.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin, wez, edward

Differential Revision: https://secure.phabricator.com/D6566
Liberate libphutil/

Summary: This function no longer exists. See D6599.

Test Plan: `arc liberate`

Reviewers: chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6600
Cast command to string in PhutilServiceProfiler

Summary: After the `PhutilCommandString` patch, DarkConsole/service profiler are showing `<object:PhutilCommandString>` instead of the actual command. String cast these so we get the command.

Test Plan: Viewed DarkConsole, saw a `git` commnand instead of `<object:PhutilCommandString>`.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6595
Allow configuration of global CA bundle in HTTPSFuture, T3668

Summary: Libphutil updates

Test Plan:
Combined with arcanist updates, used arc call-conduit to verify
CA bundle specified is used in cURL calls when endpoint is behind https with a
custom root CA (which previously failed)

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3668

Differential Revision: https://secure.phabricator.com/D6646