webtry: Simply move sys/ directory into setup/.

That seems to make things more tied and that seems to be where we have
the same scripts/configs in the perf directory:
https://skia.googlesource.com/buildbot/+/master/perf/setup/sys/

That way we keep all files used/related to setting up a new webtry server in one place.

BUG=None
TEST=None
R=humper@google.com

Review URL: https://codereview.chromium.org/644513003

experimental/webtry/DESIGN.md

@@ -251,8 +251,8 @@ Squid
 
 Squid is configured to run on port 80 and run as an accelerator for the actual
 Go program which is running on port 8000. The config for the squid proxy is
-held in sys/webtry_squid, which is copied into place during installation and
-squid is kept running via monit.
+held in setup/sys/webtry_squid, which is copied into place during installation
+and squid is kept running via monit.
 
 Workspaces
 ----------

experimental/webtry/setup/webtry_setup.sh

@@ -31,7 +31,7 @@ sudo chmod 777 /home/webtry/inout
 sudo chmod 777 /home/webtry/cache
 sudo chmod 777 /home/webtry/cache/src
 
-sudo cp ../sys/webtry_schroot /etc/schroot/chroot.d/webtry
+sudo cp sys/webtry_schroot /etc/schroot/chroot.d/webtry
 
 CHROOT_JAIL=/srv/chroot/webtry_gyp
 # Build the chroot environment.
@@ -68,9 +68,9 @@ sudo su - webtry -c /home/webtry/continue_install.sh
 
 banner "Setting up system initialization scripts"
 
-sudo cp ../sys/webtry_init /etc/init.d/webtry
-sudo cp ../sys/webtry_monit /etc/monit/conf.d/webtry
-sudo cp ../sys/webtry_squid /etc/squid3/squid.conf
+sudo cp sys/webtry_init /etc/init.d/webtry
+sudo cp sys/webtry_monit /etc/monit/conf.d/webtry
+sudo cp sys/webtry_squid /etc/squid3/squid.conf
 sudo chmod 744 /etc/init.d/webtry
 
 # Confirm that monit is happy.