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Fix wallet-rekey on keytabs containing multiple principals. Previous
versions assumed one could concatenate keytab files together to make a
valid keytab file, which doesn't work with some Kerberos libraries.
This caused new keys downloaded for principals after the first to be
discarded. As a side effect of this fix, wallet-rekey always appends
new keys directly to the existing keytab file, and never creates a
backup copy of that file.
Change-Id: I5f863239ce4ebba66b35ff09454f2897367bd359
Reviewed-on: https://gerrit.stanford.edu/1369
Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>
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