Merged PR from Sjors: [0.18] Backport #15911: Use wallet RBF default for walletcreatefundedpsbt

Merged PR from NicolasDorier: net: Restore default whitelistrelay to true

Merged PR from hebasto: doc: Add ZMQ dependencies to the Fedora build instructions

Merged PR from achow101: Return more specific errors about invalid descriptors

Merged PR from NicolasDorier: [Fix] Allow connection of a noban banned peer

Merged PR from jb55: rpcwallet: default include_watchonly to true for watchonly wallets

Merged PR from MarcoFalke: test: Rework ci (Use travis only as fallback env)

Merged PR from jamesob: refactor: have CCoins* data managed under CChainState

Merged PR from MarcoFalke: test: Test p2sh-witness and bech32 in wallet_import_rescan

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