.travis.yml: Test with disable-replication

We've had the build break with replication disabled, so lets
test that case in travis.
Suggsted-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190215094502.32149-1-dgilbert@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>

.travis.yml

@@ -95,7 +95,7 @@ matrix:
 
 
     - env:
-        - CONFIG="--disable-linux-aio --disable-cap-ng --disable-attr --disable-brlapi --disable-uuid --disable-libusb --disable-user"
+        - CONFIG="--disable-linux-aio --disable-cap-ng --disable-attr --disable-brlapi --disable-uuid --disable-libusb --disable-user --disable-replication"
 
 
     - env: