ITS#9473 Add variant overlay

contrib/slapd-modules/variant/.gitignore

contrib/slapd-modules/variant/Makefile

contrib/slapd-modules/variant/slapo-variant.5

contrib/slapd-modules/variant/tests/.gitignore

contrib/slapd-modules/variant/tests/Rules.mk

...b/slapd-modules/variant/tests/data/additional-config.ldif

contrib/slapd-modules/variant/tests/data/config.ldif

contrib/slapd-modules/variant/tests/data/hidden.ldif

.../slapd-modules/variant/tests/data/test001-01-same-dn.ldif

...slapd-modules/variant/tests/data/test001-01a-same-dn.ldif

...modules/variant/tests/data/test001-02-same-attribute.ldif

...odules/variant/tests/data/test001-03-different-types.ldif

...ib/slapd-modules/variant/tests/data/test002-01-entry.ldif

...ib/slapd-modules/variant/tests/data/test002-02-regex.ldif

contrib/slapd-modules/variant/tests/data/test003-out.ldif

...rib/slapd-modules/variant/tests/data/test005-changes.ldif

...pd-modules/variant/tests/data/test005-modify-missing.ldif

contrib/slapd-modules/variant/tests/data/test005-out.ldif

...d-modules/variant/tests/data/test005-variant-missing.ldif

contrib/slapd-modules/variant/tests/data/test006-config.ldif