chore: run jest script in jest dir (#1245)

This prevents the jest script from running any nested versions of xud
such as those that may be installed in the simulation test temp dir.

It also separates the seedutil tests from running with the rest of the
jest tests.

.travis.yml

@@ -15,6 +15,7 @@ before_install:
 
 script:
   - npm run lintNoFix
-  - npm run compile:seedutil
   - npm run test
   - npm run test:sim
+  - npm run compile:seedutil
+  - npm run test:seedutil

package.json

@@ -38,8 +38,8 @@
     "test:sim": "(npm run compile && cd test/simulation && export PATH=\"$PWD/go/bin:$PATH\" && GOPATH=$PWD/go GO111MODULE=on go test -run=TestIntegration -v)",
     "test:sim:security": "(npm run compile && cd test/simulation && export PATH=\"$PWD/go/bin:$PATH\" && GOPATH=$PWD/go GO111MODULE=on go test -run=TestSecurity -v)",
     "test:sim:instability": "(npm run compile && cd test/simulation && export PATH=\"$PWD/go/bin:$PATH\" && GOPATH=$PWD/go GO111MODULE=on go test -run=TestInstability -v)",
-    "test:jest": "jest",
-    "test:seedutil": "jest seedutil",
+    "test:jest": "jest --rootDir test/jest",
+    "test:seedutil": "jest --rootDir seedutil",
     "test:jest:watch": "jest --watch",
     "typedoc": "typedoc --out typedoc --module commonjs --target es6 lib --readme none",
     "preversion": "npm run lintNoFix && npm test && npm run compile",