Ref #3846: initial commit for technique
Fixes #3846: Handle gid/uid at user creation (Technique usermanagement)
Remove & as a forbidden character
Merge pull request #529 from coredumb/ust_5605/dev/5606/genericvariables_do_not_forbid_and_character

Fixes #5606: Remove & as a forbidden character
Merge pull request #465 from peckpeck/UST_3844/dev/3846_handle_uid_gid_at_user_creation

Ust 3844/dev/3846 handle uid gid at user creation
Merge branch 'branches/rudder/2.6' into branches/rudder/2.10