rename alto-features dir to features, per best practice: https://wiki.opendaylight...

Change-Id: Ic1fa71afd9de7cbe8b71271c4233796e3e3c851c
Signed-off-by: Y. Richard Yang <yry@cs.yale.edu>

diff --git a/alto-features/pom.xml b/features/pom.xml
similarity index 100%
rename from alto-features/pom.xml
rename to features/pom.xml

diff --git a/alto-features/src/main/features/features.xml b/features/src/main/features/features.xml
similarity index 100%
rename from alto-features/src/main/features/features.xml
rename to features/src/main/features/features.xml