Upgrade python-ldap and django-ldapdb

While there, ugrade psycopg2 which has a problem detection PostgreSQL>=10

requirements.txt

@@ -1,6 +1,6 @@
 Django>=1.8.17,<1.9
-psycopg2==2.5.4
-python-ldap==2.4.15
+psycopg2==2.7
+python-ldap==3.1.0
 wsgiref==0.1.2
 python-dateutil==2.2
 django-autocomplete-light>=2.2.10,<2.3
@@ -11,7 +11,7 @@ django-sendfile==0.3.10
 django-hijack>=2.1.10,<2.2
 django-localflavor==1.1
 django-netfields>=0.4,<0.5
-django-ldapdb>=0.4.0,<0.5
+django-ldapdb==0.9.0
 django-multiselectfield>=0.1.5
 feedparser
 six==1.10.0