pull: special case all-tags semantics

Supporting the all-tags semantics added some non-trivial code to the
pull command which does not make use of `registries.conf` and introduced
some regressions such as not adhering to the configured search registries.

Speacial case the all-tags flags to let existing users of all-tags
continue working while others can work again.  This implies that the
all-tags pull does not adhere to configured search registries while the
default (non-all-tags) pull does.

Note that this is a purely symptomaic fix.  A final solution should
include Buildah and the c/image library to avoid redundant and
error-prone code across the projects.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1701922
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

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