tests: make regtest tests somewhat faster by faster polling in e-x

using 4e66804dc0

on my machine, before-after:
Ran 9 tests in 495.865s
Ran 9 tests in 376.183s

.cirrus.yml

@@ -105,8 +105,8 @@ task:
     - apt-get update
     - apt-get -y install libsecp256k1-dev curl jq bc
     - pip3 install .[tests]
-    # install e-x some commits after 1.16.0 tag, where it uses same aiorpcx as electrum
-    - pip3 install git+https://github.com/spesmilo/electrumx.git@c8d2cc0d5cf9e549a90ca876d85fed9a90b8c4ed
+    # install e-x some commits after 1.16.0 tag
+    - pip3 install git+https://github.com/spesmilo/electrumx.git@4e66804dc0d668cd6bd4602b547e2f5b2e227e97
     - "BITCOIND_VERSION=$(curl https://bitcoincore.org/en/download/ | grep -E -i --only-matching 'Latest version: [0-9\\.]+' | grep -E --only-matching '[0-9\\.]+')"
     - BITCOIND_FILENAME=bitcoin-$BITCOIND_VERSION-x86_64-linux-gnu.tar.gz
     - BITCOIND_PATH=/tmp/bitcoind/$BITCOIND_FILENAME

electrum/tests/regtest/run_electrumx.sh

@@ -4,4 +4,4 @@ set -eux pipefail
 cd
 rm -rf $HOME/electrumx_db
 mkdir $HOME/electrumx_db
-COST_SOFT_LIMIT=0 COST_HARD_LIMIT=0 COIN=BitcoinSegwit SERVICES=tcp://:51001,rpc:// NET=regtest DAEMON_URL=http://doggman:donkey@127.0.0.1:18554 DB_DIRECTORY=$HOME/electrumx_db electrumx_server
+COST_SOFT_LIMIT=0 COST_HARD_LIMIT=0 COIN=BitcoinSegwit SERVICES=tcp://:51001,rpc:// NET=regtest DAEMON_URL=http://doggman:donkey@127.0.0.1:18554 DB_DIRECTORY=$HOME/electrumx_db DAEMON_POLL_INTERVAL_BLOCKS=100 DAEMON_POLL_INTERVAL_MEMPOOL=100 electrumx_server