parentchain set_now for block timestamps #667

Job	Run time
cargo-toml-fmt	9s
Cancel Previous Runs	2s
license-check	4m 36s
Rust check cargo build --release	4m 41s
Rust check cargo build --release --features dot	4m 43s
Rust check cargo build --release --features ksm	4m 42s
Rust check cargo test --all --features runtime-benchmarks	4m 41s
Rust check cargo test --all --features dot	4m 42s
Rust check cargo test --all --features ksm	4m 42s
Rust check cargo fmt --all -- --check	4m 30s
Rust check cargo clippy -- -D warnings	4m 30s
	41m 58s

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