Add scope compile to features pom for xtend-lib

Else, tests downstream can and will fail if its
not already in their local .m2

Change-Id: I2be472c66e4828f19169118d84ae03f714c9ec68
Signed-off-by: Ed Warnicke <eaw@cisco.com>
Merge "Add scope compile to features pom for xtend-lib"