make sure that noalert is set in newly enabled rules v2

[klingerko]

This commit adds functionality that ensures that previously
disabled rules enabled by flowbit dependencies will receive
the flowbits:noalert option.

Make sure these boxes are signed before submitting your Pull Request
-- thank you.

• I have read the contributing guide lines at
  https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Contributing
• I have signed the Open Information Security Foundation
  contribution agreement at
  https://suricata-ids.org/about/contribution-agreement/
• I have updated the user guide (in doc/userguide/) to reflect the
  changes made (if applicable)

Link
to
redmine ticket:
https://redmine.openinfosecfoundation.org/issues/2906

Describe changes:

• This commit adds functionality that ensures that previously disabled rules enabled by flowbit dependencies will receive the flowbits:noalert option.
• Set this to default behavior after the redmine ticket discussion.

[klingerko]

I have updated the pull request regarding Victors comment and have created a new one: #141