lastseen in reports is not deprecated

Bring back original documentation text, sans the control part which
no longer exists. Language and example need clarification though.

(cherry picked from commit 2833c7549784665b3ef344f525b3753b0dfddc64)
Update installation-enterprise-vagrant.markdown

Added note to disable other virtual environments when a user is installing virtual box. This is a customer feedback suggestion.
Add additional workaround information for software update issue
Merge pull request #278 from nickanderson/known_issue/software_update

Add additional workaround information for software update issue
Add known issue for cfengine-nova-hub obsoleting cfengine-nova
Merge pull request #295 from nickanderson/3.5_known_issue/2956

Add known issue for cfengine-nova-hub obsoleting cfengine-nova
Updating my branch

Merge branch '3.5' of https://github.com/cfengine/documentation into 3.5
Working to git branch in sync
Merge remote-tracking branch 'origin/3.5' into 3.5