Update sysutils/fabric to 1.9.1.

Upstream changes:
-----------------

    [Bug] #1167: Add Jinja to test_requires in setup.py for the couple of newish tests that now require it. Thanks to Kubilay Kocak for the catch.
    [Bug] #600: Clear out connection caches in full when prepping parallel-execution subprocesses. This avoids corner cases causing hangs/freezes due to client/socket reuse. Thanks to Ruslan Lutsenko for the initial report and Romain Chossart for the suggested fix.
    [Bug] #1026: Fix a typo preventing quiet operation of is_link. Caught by @dongweiming.
    [Bug] #1059: Update IPv6 support to work with link-local address formats. Fix courtesy of @obormot.
    [Bug] #1096: Encode Unicode text appropriately for its target stream object to avoid issues on non-ASCII systems. Thanks to Toru Uetani for the original patch.
    [Bug] #852: Fix to respect template_dir for non Jinja2 templates in upload_template. Thanks to Adam Kowalski for the patch and Alex Plugaru for the initial test case.
    [Bug] #1134: Skip bad hosts when the tasks are executed in parallel. Thanks to Igor Maravić @i-maravic.
    [Bug] #1146: Fix a bug where upload_template failed to honor lcd when mirror_local_mode is True. Thanks to Laszlo Marai for catch & patch.
    [Bug] #1147: Use stat instead of lstat when testing directory-ness in the SFTP module. This allows recursive downloads to avoid recursing into symlinks unexpectedly. Thanks to Igor Kalnitsky for the patch.
    [Bug] #1165: Prevent infinite loop condition when a gateway host is enabled & the same host is in the regular target host list. Thanks to @CzBiX for catch & patch.

(gls)