This commit fixes#3252
Security patches 4.2 introduced a regression - leaf clusters ignore role mapping
and attempt to use role names coming from identity of the root cluster
whenever GetNodes method was used.
This commit reverts back the logic, however it ensures that the original
fix is preserved - traits and groups are updated on the user object.
Integration test has been extended to avoid the regression in the future.
Fixes#1698.
* Added sync.Pool to take care of many gzip.Writer
allocating a lot of large objects on the heap.
* Reshuffled signal handling, SIGQUIT is now
graceful shutdown, just like in Nginx.
* Signal USR1 prints hepful diagnostic info to stderr.
* Removed gops endpoint and flags.
* Fixed logs in some places.
* Debug flag now adds extra pprof handlers to diagnostic
endpoint.
This commit introduced mutual TLS authentication
for auth server API server.
Auth server multiplexes HTTP over SSH - existing
protocol and HTTP over TLS - new protocol
on the same listening socket.
Nodes and users authenticate with 2.5.0 Teleport
using TLS mutual TLS except backwards-compatibility
cases.
Alexander Klizhentas