stack/erp5: set $TMPDIR in zeo partition

zeo uses temporary files during commit, we want to keep these temporary
files in its partition.
The reason which motivated this change was to prevent problems when
system /tmp is full. It's also consistent to how we configure other
services.

stack/erp5/buildout.hash.cfg

@@ -78,7 +78,7 @@ md5sum = d6f7d2fa1bde019892897c767f93e089
 
 [template-zeo]
 filename = instance-zeo.cfg.in
-md5sum = cfc3a6a9ce54415b57b9f935524c0d41
+md5sum = 3190fb6b2380ffbef40db62e1d4ba4d0
 
 [template-zeo-conf]
 filename = zeo.conf.in

stack/erp5/instance-zeo.cfg.in

@@ -56,6 +56,9 @@ base-name = {{ "${" ~ zeo_section_name ~"-conf:base-name}" }}
 log-path = {{ "${" ~ zeo_section_name ~"-conf:log-path}" }}
 wrapper-path = ${directory:services}/${:base-name}
 command-line = {{ bin_directory }}/runzeo -C {{ "${" ~ zeo_section_name ~"-conf:output}" }}
+environment =
+  TMPDIR=${directory:tmp}
+  TMP=${directory:tmp}
 
 [{{ section("logrotate-" ~ zeo_section_name) }}]
 < = logrotate-entry-base
@@ -206,6 +209,7 @@ srv = ${buildout:directory}/srv
 var = ${buildout:directory}/var
 log = ${:var}/log
 run = ${:var}/run
+tmp = ${buildout:directory}/tmp
 backup-zodb = {{ default_backup_path }}
 zodb = {{ default_zodb_path }}
 tidstorage = {{ tidstorage_repozo_path }}