Changes

pcap: Fix unknown packet character string

By converting the byte array to a String, the output terminates at the
first 0x00 byte encountered. Instead, iterate through every byte and
append it as a character to a string builder, replacing non-printable
characters with the middle-dot character.

[Fixed] Fix unknown packet character string

Change-Id: Ibcddb1b414ce585c0208da3a0cab81e25ff5684d
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>