[master] removed incorrect line continuation.

accidentally introduced in the previous merge, and it broke 'make install'.

src/lib/python/isc/server_common/Makefile.am

@@ -1,6 +1,6 @@
 SUBDIRS = tests
 
-python_PYTHON = __init__.py tsig_keyring.py auth_command.py dns_tcp.py \
+python_PYTHON = __init__.py tsig_keyring.py auth_command.py dns_tcp.py
 python_PYTHON += logger.py
 
 pythondir = $(pyexecdir)/isc/server_common