Give advice when GitHub API requests fail

Refs #21023.
youtube-dl 2013.07.05

Closes #21025.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
wireshark: Don't disable-wireshark if your are going to build with Qt

Ensure that if build with qt is specified, we still build wireshark.

Closes #21020.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
redis: install redis-sentinel

Install redis-sentinel binary and redis-sentinel.conf config file
along with other standard files.

Closes #21014.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
sphinx devel 2.1.1b

Closes #21021.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>