Improve error handling when using SecureStore
- if reading credentials fails remove the failing credentials from
secure store, otherwise the same error will occur again next time when
trying again to get the same credentials from a corrupted entry stored
in secure store
- improve error messages logged when a secure store operation fails
- add SecureStoreUtils.clearCredentials() to simplify error handling
Bug: 495539
Change-Id: Ie6e8712b4a8eb936bfe874c2f01ce081305ba156
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>