scalyr-agent: initial support (#1987)
scalyr-agent: fix apache log location (#1987)
add key for sending logs to scalyr (#1987)
scalyr-agent: fetch instead of distribute installer (#1987)
scalyr: factor into separate role (#1987)

It's just a bit flaky, so to start let's try this on some specific
machines to make sure it doesn't cause any trouble.  May move it into
the mainline recipes at some point later.
scalyr: agent dir pernms, runlevels, start quietly (#1987)
scalyr-agent: link directly to script for startup (#1987)

This is bad practice, but the only way to have their init script
work on startup due to some weird user changing stuff they're doing.
scalyr: add comment for workarounds (#1987)
Merge pull request #1992 from Stanford-Online/sef-1987-scalyr

deploy scalyr-agent as an optional role (#1987)