* Import upstream patch set to improve reliability and debugability:
  + upstream_Removed-not-needed-strdup.patch
    Remove an unnecessary strdup.
    UBUNTU-ERROR: 30e961156f64c241b58a65ecbb009688e3aeb2ec
    LP: #1314118
  + upstream_If-we-fail-creating-a-directory-log-it-into-syslog.patch
    Adds logging on directory creation failure
  + upstream_If-we-can-t-open-the-file-where-salt-will-be-saved-f.patch
    If the salt file cannot be opened, fail properly instead of running
    into nullptr fd crashes
    UBUNTU-ERROR: ae1ef304fcd7d26e215563c4c95fcb25a74a6559
    LP: #1314119
  + upstream_If-kwallet_hash-fails-return-with-PAM_IGNORE.patch
    When hash creation fails, fail properly instead of allowing for crashes
    later on.
  + upstream_Add-more-checks-against-null-fd.patch
    Adding nullptr checks after selected fopen() and mallocs
    UBUNTU-ERROR: 28ad0356a00142a5ec12fb842f15e18f3fae1a63
    LP: #1314120
  + upstream_Replace-fprintf-with-syslog-and-add-some-extra-ones.patch
    Prefering syslog over fprintf and adding more logging on failure