Convert features to features-parent

Convert features to features-parent

Switches from hand-written features.xml, to a processed template,
lowering the need for magic properties.

Additional changes:
 - migrated application and extensions features
 - fixed legacy
 - removed duplicate specified dependency version
 - cleaned properties
 - removed outdated version for xml-apis dependency
 - included new extensions/feature-li (pom+features)

(based on commit b4a79dbdfdc7dc00d3c1a477ad57d7c4192839fe)

Change-Id: I7089c1ee27eca228d05ec8942812a0466f71c153
Signed-off-by: Robert Varga <rovarga@cisco.com>
Signed-off-by: Michal Rehak <mirehak@cisco.com>