Update systutils/fabric to 1.3.4.

pkgsrc changes:
- Adjust dependency chain. Now depends on security/py-ssh instead of
security/py-paramiko.

Upstream changes:

The main new feature in Fabric 1.3.x is parallel tasks execution support
(invoked by fab -P).

Releases at the same time in the 1.2.x and 1.3.x branches, including the
same bugfixes.
Changes since the latest release in the 1.2.x branch (1.2.5), included in
branch 1.3:

2012-01-12: released Fabric 1.3.4
[Bug] #492: @parallel did not automatically trigger linewise output, as was
intended. This has been fixed. Thanks to Brandon Huey for the catch.
[Bug] #510: Parallel mode is incompatible with user input, such as
password/hostname prompts, and was causing cryptic Operation not supported
by device errors when such prompts needed to be displayed. This behavior
has been updated to cleanly and obviously abort instead.
[Bug] #494: Fixed regression bug affecting some env values such as env.port
under parallel mode. Symptoms included rsync_project bailing out due to a
None port value when run under @parallel. Thanks to Rob Terhaar for the
report.
[Bug] #339: Don't show imported colors members in --list output. Thanks to
Nick Trew for the report.

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