[ldapfeed] re-enable ldap tests for python 3.7 This was disabled because ldap3<2 wasn't compatible with python 3.7 While I'm here, drop unseless newline.

mock
psycopg2-binary
cubicweb-basket
cubicweb-card
cubicweb-comment
cubicweb-file >= 2.2.2
cubicweb-localperms
cubicweb-tag
ldap3<3,>2