travis.yml: Install 'realpath' package and dump main test log.

realpath is required by the integration test script. The main test
log contains useful info if / when an integration test fails.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/.travis.yml b/.travis.yml
index 5109830..a2bbe11 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,6 +21,7 @@
     packages:
     - autoconf-archive
     - cmake
+    - realpath
   coverity_scan:
     project:
       name: "01org/TPM2.0-TSS"
@@ -56,6 +57,7 @@
   - ../configure --enable-unit --with-simulatorbin=$(pwd)/../ibmtpm/src/tpm_server
   - make -j$(nproc) distcheck
   - make -j$(nproc) check
+  - cat test-suite.log
   - |
     for LOG in $(ls -1 test/unit/*.log); do
         echo "${LOG}"