erp5: jupyter.enable is boolean, not string

When originally in 0a446263 (ERP5 and Jupyter integrated together) I added
Jupyter support into ERP5 the parameter for whether to enable/disable it was
declared as boolean in JSON schema but processed as string in instance code,
this way preventing usage of real JSON's boolean.

Fix it.

(also fixing up software/slapos-master/ which copied the files for play in 87d13789)

/noticed-by @vpelletier (on nexedi/slapos!43)

software/slapos-master/instance-erp5.cfg.in

@@ -6,7 +6,7 @@
 {% set publish_dict = {'site-id': site_id, 'inituser-login': inituser_login} -%}
 {% set has_posftix = slapparameter_dict.get('smtp', {}).get('postmaster') -%}
 {% set jupyter_dict = slapparameter_dict.get('jupyter', {}) -%}
-{% set has_jupyter = jupyter_dict.get('enable', jupyter_enable_default).lower() in ('true', 'yes') -%}
+{% set has_jupyter = jupyter_dict.get('enable', jupyter_enable_default.lower() in ('true', 'yes')) -%}
 {% set jupyter_zope_family = jupyter_dict.get('zope-family', '') -%}
 [request-common]
 <= request-common-base

software/slapos-master/software.cfg

@@ -52,7 +52,7 @@ mode = 644
 [template-erp5]
 < = download-base-part
 filename = instance-erp5.cfg.in
-md5sum = 6b7712c26dfdd105e8a1143d04839651 
+md5sum = 073b96888388a39721a8cef3e90c5c5b
 
 [template-balancer]
 < = download-base-part

stack/erp5/buildout.cfg

@@ -331,7 +331,7 @@ rendered = ${monitor-template-dummy:target}
 [template-erp5]
 <= download-base
 filename = instance-erp5.cfg.in
-md5sum = cb0a8dfc15874939ec786a8b7ac5bff1
+md5sum = b5f49c90017684aa3389ef3f97ece509
 
 [template-zeo]
 <= download-base

stack/erp5/instance-erp5.cfg.in

@@ -6,7 +6,7 @@
 {% set publish_dict = {'site-id': site_id, 'inituser-login': inituser_login} -%}
 {% set has_posftix = slapparameter_dict.get('smtp', {}).get('postmaster') -%}
 {% set jupyter_dict = slapparameter_dict.get('jupyter', {}) -%}
-{% set has_jupyter = jupyter_dict.get('enable', jupyter_enable_default).lower() in ('true', 'yes') -%}
+{% set has_jupyter = jupyter_dict.get('enable', jupyter_enable_default.lower() in ('true', 'yes')) -%}
 {% set jupyter_zope_family = jupyter_dict.get('zope-family', '') -%}
 [request-common]
 <= request-common-base