cleanup tests that use regtest:

- separate setup from execution
 - install bitcoind and electrumx in travis
 - use the same framework for lnwatcher and forwarding
 - make tests runnable locally

.travis.yml

@@ -12,13 +12,20 @@ addons:
     packages:
       - libsecp256k1-0
 before_install:
+  - sudo add-apt-repository -y ppa:bitcoin/bitcoin
+  - sudo apt-get -qq update
+  - sudo apt-get install -yq bitcoind
   - git tag
 install:
   - pip install -r contrib/requirements/requirements-travis.txt
+  - pip install electrumx
 cache:
   - pip: true
   - directories:
     - /tmp/electrum-build
+before_script:
+    - electrum/tests/regtest/start_bitcoind.sh
+    - electrum/tests/regtest/start_electrumx.sh
 script:
     - tox
 after_success: