replace deprecated egrep with grep -E

[RosemaryKoshy]

egrep is the same as grep -E but direct invocation as egrep is deprecated and is only provided to allow historical applications that rely on it to run unmodified. This change modifies 8 files to use grep -E instead by replacing all instances of egrep with grep -E . I don't believe this commit will cause any problems but I'll admit I haven't tested it. It should reduce the number of warning messages.