etcd v0.3.0

Closes #26518.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
pyqt: Updated formula with Python 3 support
pyqt: Added --sip-incdir option
pyqt: Ugly hack to work around brew bot's problems with if else deps
Removed ugly hack, changed how PYTHONPATH is added.
pyqt: Changed PYTHONPATH setting