f88022cdc2
* Enable VNF vendors to customize configuration methods for applications via MgmtDriver * Load LCM interface from vnfd file * Call LCM methods from vnflcm_driver * Fix unitentional mgmt_calls in vnflcm_driver._scale_vnf_pre Note: * For UT, sqlalchemy is used, which calls functions in pymysql.py, so the dependency module PyMySQL needs to be added. * The previous implementation of ``cfg.CONF.tacker.infra_driver`` depends on the default config in legacy ``VNFMPlugin`` class in tacker/vnfm/plugin.py, so we need to fix this here. * Due to drop unitentional mgmt_calls, it makes compatibility breakage for some scale actions calls and third party driver support. This backward incompatibility was decided to keep since it is not long time since last change(Victoria release) Change-Id: Ib4ad3eb9e0a84d1a5e807d2e6004e6b2c02bf3cf