seeds: Remove manual onion and i2p seeds

The seeders now produce onion and i2p seeds, so there is no need to keep these
in the manual list.

Although should also be produced, there are not enough
good ones detected by the seeder, so we keep the manual seeds for them.

contrib/seeds/nodes_test.txt

@@ -1,29 +0,0 @@
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-nr7nozlb54xv3ozg4ksvcr3ofzfwfeud2n7xijywvt22ixzal7qa.b32.i2p:0
-o6j3b33bv26vthoqzjy3h7a3qsuqbtbe3ulajmjzsl43vaqyieyq.b32.i2p:0
-ocqipbbxx4paopgkkbnj234ie7opzrtca5gtiwr6oda3h32rzgsa.b32.i2p:0
-r2zdpkcslf7e4t2fmglu45xhfw5zgupthdh5pcewdo6jajumveda.b32.i2p:0
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-ye3ajv2tgpq7jvvzzn5wxbtmd3txev3axsdla5bkpobeiwccyjjq.b32.i2p:0
-7ph7mrc24te57mvppajfkfj4mk7zuz4teukymt3wgpdpw6vpndeivtyd.onion:18333
-bkzo7mpxuar7rhsbiwdaxqcymixarcbdmb3sdaqtv6yb2svqttz2s6ad.onion:18333
-d63vf45ta4chrewnruyvypm7ybfxtut327crtq6qfyrvcwx434rli5qd.onion:18333
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-jnphftehkfstwbko34idxlpo5fdw6lromkmeukxh3xclthlstehpg4ad.onion:18333
-jrhpwqahjrj75gtb7gt23eve65x7bbawy7j4edhmgbo5nj2mkaeghbyd.onion:18333
-jun6gdmbgasr57bhr4zs3dfhc6pzpaw27nqb4dadbai7yrbq55zskeid.onion:18333
-o52y7fadtubr4tuqhix6ymrin3qzn7ubh5tewuuehw5wxcbnfj6yaoad.onion:18333
-rigfm3joif5lsl7b7yr6d6cvddukawykm7kgguzfwi6dplckyz6x7gad.onion:18333
-t6d6epb5ccbo4e66iaanukraxpjmqiqsz6poj5uvxu2ownnhcguygdyd.onion:18333
-test2vozlxfznmfyxzkulf3l6qe6dti5hqfjsxar5lml45cjnyeusmyd.onion:18333
-uxtmtmpkfaxc6zcxaxgydrukyd5jdrcp2m5oubpimijy44rnjuywijad.onion:18333
-xuhmq42du7dckfophyr2rmf75aqkp3bk6y3wyyc6jxw7jmpp66zlm3id.onion:18333
-zcep44k7unwjm2wxty4ijh2e4fv5zgbrvwlctzyaqnrqhltjfzrtodad.onion:18333