Merge branch 'maint-0.3.5' into maint-0.4.0

changes/bug22619

changes/bug29034

changes/bug29670

changes/bug29875

changes/bug30148

changes/bug30190

changes/ticket29617

src/app/config/config.c

src/core/mainloop/connection.c

src/core/or/circuituse.c

src/feature/client/entrynodes.c

src/feature/relay/dns.c

src/feature/relay/routerkeys.c

src/lib/crypt_ops/crypto_openssl_mgt.c

src/test/test_config.c