Persist scheduler/observer logs to /var/log/aurora/[FILE].log

`journalctl -u aurora-[executor|scheduler]` still works.

Reviewed at https://reviews.apache.org/r/65896/
diff --git a/docs/getting-started/vagrant.md b/docs/getting-started/vagrant.md
index 73d0aff..318833c 100644
--- a/docs/getting-started/vagrant.md
+++ b/docs/getting-started/vagrant.md
@@ -148,7 +148,7 @@
 
 If that still doesn't solve your problem, make sure to inspect the log files:
 
-* Scheduler: `sudo journalctl -u aurora-scheduler`
-* Observer: `sudo journalctl -u aurora-executor`
+* Scheduler: `/var/log/aurora/scheduler.log` or `sudo journalctl -u aurora-scheduler`
+* Observer: `/var/log/thermos/observer.log` or `sudo journalctl -u thermos-observer`
 * Mesos Master: `/var/log/mesos/mesos-master.INFO` (also see `.WARNING` and `.ERROR`)
 * Mesos Agent: `/var/log/mesos/mesos-slave.INFO` (also see `.WARNING` and `.ERROR`)
diff --git a/examples/vagrant/aurorabuild.sh b/examples/vagrant/aurorabuild.sh
index 5eb1822..c39388f 100755
--- a/examples/vagrant/aurorabuild.sh
+++ b/examples/vagrant/aurorabuild.sh
@@ -71,7 +71,7 @@
   ./pants binary src/main/python/apache/aurora/tools:thermos_observer
   ./pants binary src/main/python/apache/aurora/tools:thermos
   sudo ln -sf $DIST_DIR/thermos.pex /usr/local/bin/thermos
-  sudo systemctl restart aurora-executor
+  sudo systemctl restart thermos
 }
 
 function build_all {
diff --git a/examples/vagrant/provision-dev-cluster.sh b/examples/vagrant/provision-dev-cluster.sh
index 4a02390..fe3281f 100755
--- a/examples/vagrant/provision-dev-cluster.sh
+++ b/examples/vagrant/provision-dev-cluster.sh
@@ -42,6 +42,18 @@
 EOF
 }
 
+function install_rsyslog_config {
+  cat >> /etc/rsyslog.d/10-aurora.conf <<EOF
+# Send scheduler logs to /var/log/aurora/scheduler.log
+:syslogtag, contains, "aurora-scheduler" /var/log/aurora/scheduler.log
+
+# Send observer logs to /var/log/thermos/observer.log
+:syslogtag, contains, "thermos-observer" /var/log/thermos/observer.log
+
+EOF
+  systemctl restart rsyslog
+}
+
 function configure_netrc {
   cat > /home/vagrant/.netrc <<EOF
 machine $(hostname -f)
@@ -94,6 +106,7 @@
 prepare_extras
 install_cluster_config
 install_ssh_config
+install_rsyslog_config
 start_services
 configure_netrc
 docker_setup
diff --git a/examples/vagrant/systemd/aurora-scheduler-kerberos.service b/examples/vagrant/systemd/aurora-scheduler-kerberos.service
index 1c2cfc4..10e4f2c 100644
--- a/examples/vagrant/systemd/aurora-scheduler-kerberos.service
+++ b/examples/vagrant/systemd/aurora-scheduler-kerberos.service
@@ -21,9 +21,11 @@
 Environment="LIBPROCESS_PORT=8083"
 Environment="LIBPROCESS_IP=192.168.33.7"
 Environment="MESOS_NATIVE_JAVA_LIBRARY=/usr/lib/libmesos.so"
-
 Environment="DIST_DIR=/home/vagrant/aurora/dist"
 
+# Identifier for rsyslog redirect (see `install_rsyslog_config` in `provision-dev-cluster.sh`).
+SyslogIdentifier=aurora-scheduler
+
 # Flags that control the behavior of the JVM.
 Environment="JAVA_OPTS='-Djava.library.path=/usr/lib \
   -Xdebug \
diff --git a/examples/vagrant/systemd/aurora-scheduler.service b/examples/vagrant/systemd/aurora-scheduler.service
index 524cbb3..57e4bba 100644
--- a/examples/vagrant/systemd/aurora-scheduler.service
+++ b/examples/vagrant/systemd/aurora-scheduler.service
@@ -21,9 +21,11 @@
 Environment="LIBPROCESS_PORT=8083"
 Environment="LIBPROCESS_IP=192.168.33.7"
 Environment="MESOS_NATIVE_JAVA_LIBRARY=/usr/lib/libmesos.so"
-
 Environment="DIST_DIR=/home/vagrant/aurora/dist"
 
+# Identifier for rsyslog redirect (see `install_rsyslog_config` in `provision-dev-cluster.sh`).
+SyslogIdentifier=aurora-scheduler
+
 # Flags that control the behavior of the JVM.
 Environment="JAVA_OPTS='-Djava.library.path=/usr/lib \
   -Xdebug \
diff --git a/examples/vagrant/systemd/aurora-executor.service b/examples/vagrant/systemd/thermos.service
similarity index 87%
rename from examples/vagrant/systemd/aurora-executor.service
rename to examples/vagrant/systemd/thermos.service
index 5a1a908..01925bc 100644
--- a/examples/vagrant/systemd/aurora-executor.service
+++ b/examples/vagrant/systemd/thermos.service
@@ -16,6 +16,9 @@
 Wants=network.target
 
 [Service]
+# Identifier for rsyslog redirect (see `install_rsyslog_config` in `provision-dev-cluster.sh`).
+SyslogIdentifier=thermos-observer
+
 ExecStart=/home/vagrant/aurora/dist/thermos_observer.pex \
   --ip=192.168.33.7 \
   --port=1338 \