problem: users want to verify that response are coming from their nodes

solution: edge node can sign received valued
Co-authored-by: Igor Artamonov <igor@artamonov.ru>

src/test/resources/tls-local/127.0.0.1.invalid.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEA0x1gOF8K9SFwQ9wohBe/EWsjLYdQ4z2yimW604BS/p1tM6xN
+4JylRWC3rawllw+cTYjLWdgd5WX43u+6i9TG3Ni19bisZamuO2HitVxEeRY/DPlB
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+cJCRbz+BAoGBAPzz/1Xq8s1lGZ6eWz7H1JlzxYLH+TzQfrV1ym7xJgR/b3rVXiJ+
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++BwDGx6zW+EdmcoaOba8FgU1AoGAV2WftWaoukUq3O0rWUceolenznBQUiYDGAn/
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+MWSy7kPeDl3JTEdNPFIIa28EQhZYupD0ihBoVspz2eQ1Y66BOfqC9nU=
+-----END RSA PRIVATE KEY-----