Code review comments: use k5_buf, ...

Also provide an accessor for getting the error unadorned.

Conflicts:
	src/include/k5-int.h
	src/lib/krb5_32.def
Don't double-adorn error messages

Conflicts:
	src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap.c
Don't double-adorn error messages

Conflicts:
	src/lib/krb5/krb/fast.c
	src/lib/krb5/krb/get_in_tkt.c
	src/lib/krb5/krb/preauth2.c
Don't adorn error messages when logging
Include file ccache name in error messages

Conflicts:
	src/lib/krb5/ccache/cc_file.c
Code review comments about fcc_set_error()

Conflicts:
	src/lib/krb5/ccache/cc_file.c
Code review comments for interpret_errno()

Conflicts:
	src/lib/krb5/ccache/cc_file.c
Fix tests that break bc of changed messages
Fix dejagnu tests that break bc of changed messages