This commit adds a flag (-a) that loads anchor peers from files.
The files can be created easily using any text editor and
they are in the following format:
host
port
pem certificate

The parameter of the anchor peer is a comma separated
file list.

Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>
Change-Id: I59cda7b09251b1ef6e7475d70e975e3369915eff