b_ula: use b1_8_iam for ldiskfs instead of HEAD

support "lustrecvs b_ula" to check out the lnet "User Level Access" (ULA) development branch.

b=14156

Use b1_8_iam tag for b_mount_perm branch.

b=11842

Use b1_8_iam tag for b_remote_acl branch.

use b1_8_iam ldiskfs for b_mixed_layout_req.

- using b1_8_iam ldiskfs for b1_8_dir_ra.

Add support for the ldiskfs tag on release branches.

Sort versions alphabetically.

Make b1_8 an alias for HEAD to prevent mistakes.

the section is added to support "lustrecvs b_usocklnd" (lnet usocklnd development branch)

Move ldiskfs to its own package and CVS module.

b=12068
i=mjmac
i=brian

    branch.

create a new lnet branch for b_new_cmd

create new branch b_new_portals for colibri team

create new branch b_new_lnet for new cmd

Don't try to check out portals anymore, we don't need it.
r=eeb

Per Eric's request - remove portals from the build tree, as he is testing
with Cray portals directly, when testing the ptllnd.
r=eeb

b1_4-patchless lnet version requirements are same as for b1_4