[MacPorts] #53404: `port upgrade outdated` changes colours in terminal emulation

[MacPorts]

#53404: `port upgrade outdated` changes colours in terminal emulation
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 Reporter:  ballapete                 |      Owner:
     Type:  defect                    |     Status:  new
 Priority:  Normal                    |  Milestone:
Component:  ports                     |    Version:
 Keywords:  macOS Sierra, GNU Emacs,  |       Port:  port
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 When I run `sudo port upgrade outdated` it produces for example this
 output:

 {{{
 --->  Computing dependencies for openssl
 --->  Fetching archive for openssl
 --->  Attempting to fetch openssl-1.0.2k_0.darwin_16.x86_64.tbz2 from
 http://nue.de.packages.macports.org/openssl
 --->  Attempting to fetch openssl-1.0.2k_0.darwin_16.x86_64.tbz2.rmd160
 from http://nue.de.packages.macports.org/openssl
 --->  Installing openssl @1.0.2k_0
 --->  Cleaning openssl
 --->  Computing dependencies for openssl
 --->  Deactivating openssl @1.0.2j_0
 --->  Cleaning openssl
 --->  Activating openssl @1.0.2k_0
 --->  Cleaning openssl
 --->  Updating database of binaries
 --->  Scanning binaries for linking errors
 --->  No broken files found.
 }}}

 The last line is coloured in red – and this colour is the propagated and
 colours prompt, input, and output. See attached screenshot!

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Ticket URL: <https://trac.macports.org/ticket/53404>
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