Removed st2web dependency on st2 module#279

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nmaludy wants to merge 3 commits intomasterfrom

hotfix/st2web-dependency

Commits on Dec 22, 2020

Removed st2web dependency on st2 module
nmaludy
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Commits on Dec 23, 2020

Merge remote-tracking branch 'origin/master' into hotfix/st2web-dependency
nmaludy
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Added new variable st2web_version to control version of st2web that is installed
nmaludy
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