NIFI-3694 updated latest logback,jetty,moved servlet-api and jetty-sc…

[joewitt]

…hemas to lib root as needed now

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[YolandaMDavis]

@joewitt I will take a look, thanks!

[YolandaMDavis]

@joewitt ran local test using smaller maxFileSize, maxHistory and totalSizeCap settings. Created a flow that used LogAttribute heavily. nifi-app.log appeared to rotate and was purged as expected.

+1

Will merge into master shortly