Skip possible IO extensive operations for vhostalias creation on "web" document root

JanThielrequested to merge
JanThiel/ispconfig3:bugfix/6052_Prevent-recursive-io-ops-on-alias-vhosts into develop

Skip possible IO extensive operations for vhostalias creation on "web" document root. There should not be any need to rerun them. Fixes #6052 (closed)

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