Backport cascache push/pull messages

Qinustyrequested to merge
Qinusty/553-backport-1.2 into bst-1.2

Description

See !553 (merged)

Changes proposed in this merge request:

  • Make Element._get_brief_display_key() available to internal API
  • Add info messages to cascache.py to inform the user of each remote.

This merge request, when approved, will close issue/bug: N/A

Edited by Qinusty

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