[submodule]: update sonic-swss

* 0c07a80 2018-12-27 | [intfmgrd]: Merge intfsyncd into intfmgrd (sonic-net#635) (HEAD, origin/master, origin/HEAD) [Marian Pritsak]
* a45c7b5 2018-12-23 | [watermark] fix watermark clear not working for PG (sonic-net#729) [Mykola F]
*   25d16b3 2018-12-23 | [neighorch] return back original condition for port oper status (sonic-net#727) [Qi Luo]
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| * 05a3558 2018-12-12 | [neighorch] return back original condition for port oper status [Stepan Blyschak]
* | 514cfef 2018-12-23 | [swssconfig]: Remove deprecated qos buffer configurations (sonic-net#726) [Shuotian Cheng]
* | 025268a 2018-12-22 | [WR]: Add reconciliation logic for teamsyncd (sonic-net#725) [pavel-shirshov]
* | 5803a8c 2018-12-21 | Fix: crash while destructing crmorch (sonic-net#731) [Qi Luo]
* | 998b4ab 2018-12-21 | Temporarily skip the testcase test_routing_WarmRestart to unblock other pull requests (sonic-net#733) [Qi Luo]
* | a7a68c1 2018-12-19 | Optimize neigh restore process during warm-reboot (sonic-net#722) [zhenggen-xu]
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* 3d60b3e 2018-12-03 | [portsorch] Portsorch simple improvements (sonic-net#718) [stepanblyschak]

Signed-off-by: Guohan Lu <gulv@microsoft.com>