include GlobalSign CA on labs LDAP servers

needed for new certs added in I9dfc819bdc2e706

or we have a failure when puppet tries to create
the chained cert:

<+icinga-wm> PROBLEM - Certificate expiration on labcontrol2001
is CRITICAL: SSL error: [Errno 1] _ssl.c:504: error:14090086:SSL

< mutante> bin/cat ldap-eqiad.wikimedia.org.pem GlobalSign_CA.pem
 > /etc/ssl/certs/ldap-eqiad.wikimedia.org.chained.pem returned 1 instead of one of [0]

< mutante> /bin/cat: GlobalSign_CA.pem: No such file or directory

Change-Id: I52c2683e1a2c9d4c099777b68625d2087205044e