FreeNAS/freenas bdf7aa3gui/middleware multipath.py notifier.py, gui/storage views.py

Merge pull request #2499 from freenas/FIX-70536-11.2-72729

tkt-72729: Multipath to middlewared (by themylogin)
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+136-0src/middlewared/middlewared/plugins/multipath.py
+0-74gui/middleware/multipath.py
+12-19gui/storage/views.py
+1-14gui/middleware/notifier.py
+149-1074 files

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