Version 1.15.2

All fixes cherry-picked from the original-Fabric 1.14.1 release:

• contrib.files.upload_template: compatible with non-bash /bin/sh - fabric/fabric#1227
• move getpass import inside try/except for win32 support - fabric/fabric#983
• contrib.project.rsync_project: avoid "--rsh" arg for rsync when using default port - fabric/fabric#1242
• sftp put: clean up temp file for "sudo" mode on any error - fabric/fabric#1341