SWC-3414: combine executions of the same plugin into the same plugin definition (with multiple executions).  also update maven-war-plugin version to latest
SWC-3414: combine executions of the same plugin into the same plugin definition (with multiple executions).  also update maven-war-plugin version to latest

Sage-Bionetworks/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,jay-hodgson/SynapseWebClient,jay-hodgson/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,jay-hodgson/SynapseWebClient,Sage-Bionetworks/SynapseWebClient,jay-hodgson/SynapseWebClient