'dsctl ldifgen groups' should generate unsorted members or at least provide an option for this

[tbordaz]

Issue Description

dsctl localhost ldifgen groups  --number 1 --num-members 10000 --suffix dc=example,dc=com --ldif-file /tmp/group_1K.ldif big_group_1K

generates a ldif containing sorted members like

dn: cn=big_group_1K-1,dc=example,dc=com
objectclass: top
objectclass: groupOfUniqueNames
objectclass: groupOfNames
objectclass: inetAdmin
cn: cn=big_group_1K-1,dc=example,dc=com
uniquemember: uid=user0000001,dc=example,dc=com
uniquemember: uid=user0000002,dc=example,dc=com
uniquemember: uid=user0000003,dc=example,dc=com
uniquemember: uid=user0000004,dc=example,dc=com
uniquemember: uid=user0000005,dc=example,dc=com
uniquemember: uid=user0000006,dc=example,dc=com
...

This is a problem as this list of values is sorted and is a specific case that does not reflect what are usual static groups.

Package Version and Platform:
since 2.0

Steps to Reproduce
Steps to reproduce the behavior:

dsctl localhost ldifgen groups  --number 1 --num-members 10000 --suffix dc=example,dc=com --ldif-file /tmp/group_1K.ldif big_group_1K

Expected results
a non sorted list