Username tags are broken in version 2.1.4

[r-owen]

I'm finding that username tags don't work with eups version 2.1.4. I can assign them, but they are ignored when I try to setup using them. Here is an example:

$ eups list starlink_ast
   lsst-dev-g6ab8ff23d8     b2294 current setup
   tickets.DM-11895-g49a72c33b2     rowen b2293
# specifying my username tag fails: it sets up the current version instead
$ setup -r . -v -t rowen
Setting up: astshim                         Flavor: DarwinX86  Version: LOCAL:/Users/rowen/UW/LSST/lsstsw3/build/astshim
Setting up: |sconsUtils                     Flavor: DarwinX86  Version: 13.0-12-g27c31b4
...
# specifying a bxxx tag succeeds
Setting up: |starlink_ast                   Flavor: DarwinX86  Version: lsst-dev-g6ab8ff23d8
$ setup -r . -v -t b2293
Setting up: astshim                         Flavor: DarwinX86  Version: LOCAL:/Users/rowen/UW/LSST/lsstsw3/build/astshim
Setting up: |sconsUtils                     Flavor: DarwinX86  Version: 13.0-12-g27c31b4
...
Setting up: |starlink_ast                   Flavor: DarwinX86  Version: tickets.DM-11895-g49a72c33b2

This is debilitating for working on multiple packages at the same time.

Fortunately I figured out a workaround: add "rowen" to stack/ups_db/globals.tags

This is on macOS 10.12.6 using a version of lsstsw that is about a week old