Add ACL support to dashboard tabs

Dashboard tabs could be seen by other users than admin with fd#5734 so plugins adding tab to dashboard should make sure ACLs are respected and no info is shown that the user is not allowed to see.

Actual behavior

All data is displayed

Expected behavior

Only allowed data should be displayed

Step by step description of new behaviour

1. Go to dashboard systems or network tab
2. You should only see systems and information you are allowed to see

Benefits

Give dashboard access to managers

Possible Drawbacks

Computing stats might be a bit slower

created branch 5746-add-acl-support-to-dashboard-tabs

mentioned in commit 4663ff7f

added 1h of time spent at 2017-12-06

created branch 5746-add-acl-support-to-dashboard-tabs

mentioned in commit 19f92b20

added 1h 30m of time spent at 2017-12-07

added To Be Tested label

created branch 5746-add-acl-support-to-dashboard-tabs

mentioned in commit 884d0794

added PJ1703-0080 label

Tested in 1.3-dev with systems plugin and it's working nicely.

added 20m of time spent at 2018-01-10

removed To Be Tested label

added Added and removed enhancement labels

closed