test: add scenario 'netnsRegtest'

The 'basic' test command now cover regtest mode and using nix-bitcoin without
the secure-node preset.

.travis.yml

@@ -16,7 +16,7 @@ env:
   jobs:
   - TestModules=1 STABLE=1 SCENARIO=default
   - TestModules=1 STABLE=1 SCENARIO=netns
-  - EvalModules=1 STABLE=1
+  - TestModules=1 STABLE=1 SCENARIO=netnsRegtest
   - PKG=hwi STABLE=1
   - PKG=hwi STABLE=0
   - PKG=lightning-charge STABLE=1
@@ -35,12 +35,6 @@ env:
   - PKG=joinmarket STABLE=0
 script:
   - printf '%s (%s)\n' "$NIX_PATH" "$VER"
-  #
-  - |
-    if [[ $EvalModules ]]; then
-      test/run-tests.sh --scenario full eval
-      travis_terminate 0
-    fi
   - |
     getBuildExpr() {
         if [[ $TestModules ]]; then