Added ping_addr() to take care of case of ping from ic_timeo().

Commented out performance hack which caused concurrency bug
in icmp_addr() : global variable inetifp may not always be set when
icmp_addr() is called. (For example, not set when called via ic_time

Commented out performance hack which caused concurrency bug
in icmp_addr() : global variable inetifp may not always be set when
icmp_addr() is called. (For example, not set when called via ic_timeo())

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