[SYNSD-1233] Adding in a try/catch for HTTP 409 conflicts on entity creation#1131

BryanFauble wants to merge 6 commits intodevelopSage-Bionetworks/synapsePythonClient:developfrom

synsd-1233-http-conflict-on-createSage-Bionetworks/synapsePythonClient:synsd-1233-http-conflict-on-createCopy head branch name to clipboard