gdb: allow gdbclient.py to find local files.

gdbclient.py is always downloading the stripped version of executable
files from the device. This CL first tries to find the unstripped local
file before falling back to the stripped version.

Bug: http://b/24947939
Change-Id: I7a49d0d8b28590ee99ce892d3e3476921f4ae974
2 files changed