Fix items deleting in file keyring (Fixes #123), add a test for that
Merged in mitya57/python-keyring-lib (pull request #38)

Fix items deleting in file keyring (Fixes #123), add a test for that
Extracted _get_best_keyring function.

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extra : rebase_source : 1e3ff9e4daa4f49665f20756ccbff786508efca4
Add the global attribute at the beginning to suppress warnings about undefined variable.

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extra : rebase_source : af8f6f9afd814b3af5ec35805491c15db825e4d2
Ensure any keyring loaded by load_config invokes .priority to provide nicer error messages when a specified keyring is not viable. Fixes #120.

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extra : rebase_source : 55723ba57fdaccf2b336191956b052930f567d95