[OSGi] Make EmbeddedFelixFramework pluggable

[neykov]

Needs different implementations depending on whether running in Karaf or classical. Can't have EmbeddedFelixFramework loaded in Karaf because felix bundle doesn't export org.apache.framework packages, just generic OSGi ones.

Needs to be rebased on master after merging #65 for a successful build.

[neykov]

With this change next error when deploying MachineEntity is:

java.lang.NoClassDefFoundError: com/maxmind/db/Reader$FileMode
    at com.maxmind.geoip2.DatabaseReader$Builder.<init>(DatabaseReader.java:66)
    at org.apache.brooklyn.core.location.geo.MaxMind2HostGeoLookup.getDatabaseReader(MaxMind2HostGeoLookup.java:54)
    at org.apache.brooklyn.core.location.geo.HostGeoInfo.findHostGeoLookupImpl(HostGeoInfo.java:161)
    at org.apache.brooklyn.core.location.geo.HostGeoInfo.getDefaultLookup(HostGeoInfo.java:78)
    at org.apache.brooklyn.core.location.geo.HostGeoInfo.fromIpAddress(HostGeoInfo.java:65)
    at org.apache.brooklyn.core.location.geo.HostGeoInfo.fromLocation(HostGeoInfo.java:115)
    at org.apache.brooklyn.location.localhost.LocalhostMachineProvisioningLocation.configure(LocalhostMachineProvisioningLocation.java:145)
    at org.apache.brooklyn.location.localhost.LocalhostMachineProvisioningLocation.configure(LocalhostMachineProvisioningLocation.java:72)

[neykov]

After last commit (adding a dependency) I was able to deploy a MachineEntity to byon using

brooklyn.catalog:
  items:
  - id: machine
    libraries:
    - name: org.apache.brooklyn.software-base
      version: 0.9.0.SNAPSHOT
    item:
      type: org.apache.brooklyn.entity.machine.MachineEntity

location: byon:(hosts=x.x.x.x)
services:
- type: machine

The application started successfully (YAY!). The UI was behaving weirdly though, sensors & tasks were not getting populated.

[geomacy]

👍 I like it - like the move to having the common interface, and then loading the appropriate implementation based on which mode you are running in. LGTM.