9329ef0bc4
Headers were encoded in HTTPClient, but when glance client started to use SessionClient this functionality was lost. This commit replaces static method "encode_headers" from HTTPClient and makes it a common function, that SessionClient can use when converting image meta to headers. Change-Id: If9f8020220d2a0431b4241b38b9c83c09c0d75cb Closes-bug: #1574587