ospfd redistribute maximum prefix support

RE-stable-0.99 RE-testing-0.99 summary
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71a7624        54bf990         ospfd: basic "redistribute maximum-prefix" support
d529425        03a920c         ospfd: improve maximum-prefix implementation
c0c884a        daa3917         ospfd: justify maximum-prefix LSA counter
7bef791        5470d65         ospfd: redo lsa_redistribute_count processing
0166f3b        c598dfe         ospfd: use hard limit in maximum-prefix check
23f1d91        30313b8         doc: "redistribute maximum-prefix" in ospfd