Revert "Remove testAtSignInUserInfo and add testMultipleUserField"

This reverts commit f8af58ccae4dadba701f4e1cc0229d1416f90cf0.

This change was auto-merged from nougat*-cts-dev branches and is not
intended for aosp master.

Test: libcore.java.net.URLTest
Change-Id: I3f77dc3b0f93fad2aec06d86e9bb622c6aa0ef7d
1 file changed