vitess/lite: Install config files at the new location. (vitessio#5707)

The expected location of config files has changed, but we were still
installing them in the old location. This also adds a symlink from the
old location to remain backwards-compatible.

Signed-off-by: Anthony Yeh <enisoc@planetscale.com>

Makefile

@@ -74,7 +74,10 @@ install: build
  mkdir -p "$${PREFIX}/bin"
  cp "$${VTROOT}/bin/"{mysqlctld,vtctld,vtctlclient,vtgate,vttablet,vtworker,vtbackup} "$${PREFIX}/bin/"
  # config files
- cp -R config "$${PREFIX}/"
+ mkdir -p "$${PREFIX}/src/vitess.io/vitess"
+ cp -R config "$${PREFIX}/src/vitess.io/vitess/"
+ # also symlink config files in the old location
+ ln -sf src/vitess.io/vitess/config "$${PREFIX}/config"
  # vtctld web UI files
  mkdir -p "$${PREFIX}/src/vitess.io/vitess/web"
  cp -R web/vtctld "$${PREFIX}/src/vitess.io/vitess/web/"