Fix odl-yanglib feature usage

Fix odl-yanglib feature usage

The problem is that Initialization stops working correctly and
expect non-empty YanglibConfig provided by blueprint.

Were set default cache-folder to cache/schema, binding-addr to
localhost and binding-port port 8181 by creating new config
file.

JIRA: NETCONF-909
Change-Id: I76455310d014a5ad87051cb0ac749f5ce9f010c1
Signed-off-by: Yaroslav Lastivka <yaroslav.lastivka@pantheon.tech>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit 11ced7438f39559415565864c085fc0ec4422f4d)