Closes Homebrew/homebrew#40172.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

This reverts commit 580cd173cbf92aa9851e68d635af518a668a6cdc.

Fixes Homebrew/homebrew#39950.

Fixes Homebrew/homebrew#40171.

This cuts the amount of custom code fairly drastically, applying the
same generic syntax across the different SSL/TLS enforced areas.

It also makes the failure message fit onto one terminal line, which
looks cleaner than the multi-line message we currently print
for standard-size Terminals.

Changes something like:

`ftp.gnu.org urls should be https://, not http:// (url is http://ftp.gnu.org/gnu/gawk/gawk-4.1.1.tar.xz)`

Into:

`Please use https:// for http://ftp.gnu.org/gnu/gawk/gawk-4.1.1.tar.xz`



References: Homebrew/homebrew#39421 Homebrew/homebrew#39306

Closes Homebrew/homebrew#40054.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

keg_only? should use 'rack' not 'canonical_name'

Closes Homebrew/homebrew#40124.
Closes Homebrew/homebrew#40126.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

This defaults to the value that's in the bottle but that isn't
necessarily correct. For example, some Boxen modules will reuse our
old bottles and so if they are installed from there we should be sure
to set the tab's tap to the tap we've installed from rather than the one
set inside the bottle's tarball.

Closes Homebrew/homebrew#40096.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Bored of dealing with the bottle conflicts errors here so I don't think
it's really worth working around.

Closes Homebrew/homebrew#40097.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#39524.

Signed-off-by: Xu Cheng <xucheng@me.com>