[PackageManager] Make pkg_by_name() more predictable

As highlighted in #1817, `pkg_by_name()` could provide unpredictable
results, when using wildcards. As such, limited this method to only
returning package info for exact package name matches. In turn, change
`Plugin.is_installed()` to leverage `PackageManager.all_pkgs_by_name()`
which does explicitly support wildcards and returns information on _all_
matching packages, not just the last one found.

In so doing, clean up the `PackageManager` design to use a new
`packages` property for these lookups, and update the former usage of
`all_pkgs()` accordingly. Similarly, signal `get_pkg_list()` should be
private (in any sense that a python method can be) by renaming to
`_get_pkg_list()` and update the single Plugin (`etcd`) referencing this
method.

Closes: #1817

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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