rotate osqueryd logs on SIGHUP
Closes#1256
Note: Sometimes the test fails to rotate the log on SIGHUP, although
that doesn't appear to be the case with a long running process.
After some discussion and debugging with @zwass we agreed to call
t.Log and come back to this issue at a later time.
Use the [SockJS Protocol](https://github.com/sockjs/sockjs-protocol) to handle
bidirectional communication instead of plain websockets. This allows
distributed queries to function in situations in which they previously failed
(Load balancers not supporting websockets, issues with Safari and self-signed
certs, etc.).
Also includes fixes to the JS message handling logic where slightly different
message delivery semantics (when using XHR) were exposing bugs.
Fixes#1241, #1327.
Due to recreating the 'All Hosts' label in #1282, we get inconsistent counts
for hosts that have not checked in since that migration. This seems acceptable
for other labels, but it is important that 'All Hosts' really includes all the
hosts.
This migration adds all the hosts into that label.
Fixes#1329
