If the --wipe_data command is being passed to recovery, skip the
signature check since the data will be wiped after the update is
installed
Change-Id: I6641f25abd044110faaf170ab2f7982460e77bcb
It appears that some versions of sed do not work with the + symbol.
Instead of checking for one or more digits, check for a digit,
followed by zero or more digits.
Change-Id: I064df6a2bac4a634a3684ac1a5289dca1f4ba29c
