client.py: fix punctuation typo
modules/zpool : add iostat function

Displays I/O statistics for the given pools
cmd state: add space after comma

************* Module salt.states.cmd
C0324:616,8:script: Comma not followed by a space
        cmd_kwargs.update({'args': name.split(' ',1)[1]})
                                                 ^^
Merge pull request #5225 from cvrebert/patch-1

client.py: fix punctuation typo
Merge pull request #5226 from cvrebert/patch-2

cmd state: add space after comma
xapi mod: add comma after space

************* Module salt.modules.xapi
C0324:722,16:vm_netstats._info: Comma not followed by a space
                ret[vif_rec['device']] = _get_metrics_record(xapi,'VIF',
                                                                 ^^
                                                            vif_rec)
Merge pull request #5227 from cvrebert/patch-3

xapi mod: add comma after space
bridge mod: add spaces after commas

************* Module salt.modules.bridge
C0324:211,4:_os_dispatch: Comma not followed by a space
Merge pull request #5228 from cvrebert/patch-4

bridge mod: add spaces after commas
fix new pylint W1401 (Anomalous backslash in string) instances
Various pylint fixes to the xapi module

************* Module salt.modules.xapi
E0602: 58,14:_get_xapi_session: Undefined variable 'CommandExecutionError'
W0702: [many instances]: No exception type(s) specified
zfs module: rm unused import of the `os` std lib module
bridge module: avoid bare `except:`

************* Module salt.modules.bridge
W0702:287,12:find_interfaces: No exception type(s) specified
pkg state: fix pylint W0604

************* Module salt.states.pkg
W0604: 48,4: Using the global statement at the module level
modules/zpool : add scrub function

Begin a scrub on selected zpool
Merge pull request #5238 from virtua-network/zpool_module

Zpool module
Merge pull request #5232 from cvrebert/patch-5

zfs module: rm unused import of the `os` std lib module
Merge pull request #5230 from hulu/xapi

Various pylint fixes to the xapi module
Merge pull request #5233 from cvrebert/patch-6

bridge module: avoid bare `except:`
Don't use a bare exception