[GEODE-42] Remove hardcoded versioning from GemFireVersion.properties file
[GEODE-42] Remove hardcoded versioning from GemFireVersion.properties file

The version information was hardcoded in the initial drop of the Geode code base. This change allows the build to get source revision information from Git, if available. If source information is not available, then value  is 'UNKNOWN'.

Tested with and without Git workspace.

Reviewed by: amb

davinash/geode,fengshao0907/incubator-geode,prasi-in/geode,robertgeiger/incubator-geode,nchandrappa/incubator-geode,charliemblack/geode,reshmik/incubator-geode,mattcaldwell/incubator-geode,PurelyApplied/geode,ysung-pivotal/incubator-geode,deepakddixit/incubator-geode,deepakddixit/incubator-geode,pdxrunner/geode,PurelyApplied/geode,masaki-yamakawa/geode,kidaa/incubator-geode,sshcherbakov/incubator-geode,prasi-in/geode,prasi-in/geode,PurelyApplied/geode,smanvi-pivotal/geode,reshmik/incubator-geode,deepakddixit/incubator-geode,davinash/geode,prasi-in/geode,shankarh/geode,smanvi-pivotal/geode,jdeppe-pivotal/geode,davebarnes97/geode,fengshao0907/incubator-geode,davebarnes97/geode,davinash/geode,robertgeiger/incubator-geode,smgoller/geode,ysung-pivotal/incubator-geode,jdeppe-pivotal/geode,pdxrunner/geode,ysung-pivotal/incubator-geode,zuowang/incubator-geode,PurelyApplied/geode,shankarh/geode,jdeppe-pivotal/geode,zuowang/incubator-geode,smanvi-pivotal/geode,sshcherbakov/incubator-geode,davebarnes97/geode,shankarh/geode,smgoller/geode,davebarnes97/geode,nchandrappa/incubator-geode,zuowang/incubator-geode,masaki-yamakawa/geode,nchandrappa/incubator-geode,fengshao0907/incubator-geode,pdxrunner/geode,jdeppe-pivotal/geode,robertgeiger/incubator-geode,jdeppe-pivotal/geode,pivotal-amurmann/geode,nchandrappa/incubator-geode,masaki-yamakawa/geode,PurelyApplied/geode,kidaa/incubator-geode,smgoller/geode,prasi-in/geode,smgoller/geode,pivotal-amurmann/geode,mattcaldwell/incubator-geode,pivotal-amurmann/geode,pdxrunner/geode,zuowang/incubator-geode,pdxrunner/geode,deepakddixit/incubator-geode,smanvi-pivotal/geode,shankarh/geode,charliemblack/geode,robertgeiger/incubator-geode,smgoller/geode,sshcherbakov/incubator-geode,davinash/geode,kidaa/incubator-geode,davinash/geode,charliemblack/geode,deepakddixit/incubator-geode,fengshao0907/incubator-geode,deepakddixit/incubator-geode,masaki-yamakawa/geode,deepakddixit/incubator-geode,sshcherbakov/incubator-geode,mattcaldwell/incubator-geode,pdxrunner/geode,PurelyApplied/geode,shankarh/geode,davebarnes97/geode,charliemblack/geode,davebarnes97/geode,masaki-yamakawa/geode,ysung-pivotal/incubator-geode,davinash/geode,charliemblack/geode,smanvi-pivotal/geode,PurelyApplied/geode,pivotal-amurmann/geode,davinash/geode,smgoller/geode,pdxrunner/geode,masaki-yamakawa/geode,jdeppe-pivotal/geode,mattcaldwell/incubator-geode,reshmik/incubator-geode,kidaa/incubator-geode,davebarnes97/geode,masaki-yamakawa/geode,jdeppe-pivotal/geode,pivotal-amurmann/geode,reshmik/incubator-geode,smgoller/geode