thread local chain type vs global chain type (#3327)

* Introduce GLOBAL_CHAIN_TYPE and make CHAIN_TYPE thread_local.
This makes testing more explicit and significantly more robust.

* set_local_chain_type() in tests

* cleanup - weird

* get pool tests working with explicit local chain_type config

* core tests working with explicit local chain_type

* p2p tests working with explicit local chain_type

* store tests working

* cleanup, feedback

pool/src/types.rs

@@ -17,12 +17,12 @@
 
 use chrono::prelude::{DateTime, Utc};
 
+use self::core::consensus;
 use self::core::core::block;
 use self::core::core::committed;
 use self::core::core::hash::Hash;
 use self::core::core::transaction::{self, Transaction};
 use self::core::core::{BlockHeader, BlockSums};
-use self::core::{consensus, global};
 use failure::Fail;
 use grin_core as core;
 use grin_keychain as keychain;
@@ -144,7 +144,7 @@ fn default_max_stempool_size() -> usize {
 	50_000
 }
 fn default_mineable_max_weight() -> usize {
-	global::max_block_weight()
+	consensus::MAX_BLOCK_WEIGHT
 }
 
 /// Represents a single entry in the pool.