travis.yml: Start simulator before 'make check'.

Turns out the simulator must be runing for the integration tests to
work.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/.travis.yml b/.travis.yml
index 0ea4784..3944ac1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,9 +24,9 @@
   - pushd ./build
   - ../configure --enable-unit
   - make -j$(nproc)
-  - make check
   - make simulator-build
   - make simulator-start
+  - make check
   - test/tpmclient/tpmclient
   - make simulator-stop
   - |