Fix some "Traffic Edge" strings

We should cleanup some of the old "Traffic Edge" strings, e.g.

/export/apache/trafficserver.git/proxy/mgmt2/RecordsConfig.cc:

{CONFIG, "proxy.config.product_name", "", INK_STRING, "Traffic Edge", RU_NULL, RR_NULL, RC_NULL, NULL, RA_NULL}

/export/apache/trafficserver.git/proxy/mgmt2/web2/WebHttpRender.cc: // bug 52754: For Tsunami only, need to hack in Traffic Edge
/export/apache/trafficserver.git/proxy/InkAPITest.cc: char *CONFIG_PARAM_STRING_VALUE = "Traffic Edge";