Egw upgrade extgw 362#170

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salinda89 wants to merge 4 commits intoWSO2Telco:egw-upgradefrom

salinda89:egw_upgrade_EXTGW-362

Commits on Jun 12, 2019

[EXTGW-362] - introduce new property file reading mechanism and general cache with loading pattern
salinda89
committed
[EXTGW-362] - update pom
salinda89
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Commits on Jun 17, 2019

[EXTGW-362] - performance improvement + introduce lazy logging support
salinda89
committed

Commits on Jun 19, 2019

[EXTGW-362] - lower logger class access
salinda89
committed