Made suffix length of rotated logcat files constant.

The suffix now uses as many digits as needed to cover the maximum number
of rotated files.

eg, for 20 files it would use 2 digits: log_file.{01,02,03,...,20}

Change-Id: I4709b3cf4bf88c209db3c4d9e24a3a4731c98bae
2 files changed