Added ldap3 to requirements

requirements.txt

@@ -12,6 +12,8 @@ celery==4.0.2
 click==6.7
 coverage==4.3.4
 curtsies==0.2.11
+enum-compat==0.0.2
+eventlet==0.21.0
 Flask==0.12
 Flask-Migrate==2.0.3
 Flask-Script==2.0.5
@@ -23,6 +25,7 @@ greenlet==0.4.12
 itsdangerous==0.24
 Jinja2==2.9.5
 kombu==4.0.2
+ldap3==2.2.2
 lxml==3.7.3
 Mako==1.0.6
 MarkupSafe==0.23
@@ -30,6 +33,7 @@ nose==1.3.7
 packaging==16.8
 pathtools==0.1.2
 psycopg2==2.6.2
+pyasn1==0.2.3
 Pygments==2.2.0
 pyldap==2.4.28
 pyparsing==2.1.10