memcached: Update fixes fixe security issues

memcached was updated to version 1.4.20 to fix five security issues.

These security issues were fixed:

- DoS when printing out keys to be deleted in verbose mode (CVE-2013-0179)
- Remote DoS (crash) via a request that triggers "unbounded key print" (CVE-2013-7291)
- Remote DoS (segmentation fault) via a request to delete a key (CVE-2013-7290)
- SASL authentication allows wrong credentials to access memcache (CVE-2013-7239)
- Remote DoS (CVE-2011-4971)

Fixed bugs
bnc#798458
VUL-1: CVE-2013-0179: memcached: DoS when printing out keys to be deleted in verbose mode
bnc#858676
VUL-1: CVE-2013-7291: memcached: remote DoS (crash) via a request that triggers "unbounded key print"
bnc#858677
VUL-1: CVE-2013-7290: memcached: remote DoS (segmentation fault) via a request to delete a key
bnc#817781
VUL-1: memcached: CVE-2011-4971: remote DoS
bnc#857188
VUL-0: CVE-2013-7239: memcached: SASL authentication allows wrong credentials to access memcache
Selected Binaries
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