cosmetic: rename mgcp_ep.c/h to mgcp_endp.c/h

The short term of endpoint has always been "endp" througout the whole
project and not "ep".

- rename mcgp_ep.c to mgcp_endp.c

- rename mgcp_ep.h to mgcp_endp.h

Change-Id: Id52047bb2d0407655ac272c858ed3412b8ae9e6d
diff --git a/src/libosmo-mgcp/Makefile.am b/src/libosmo-mgcp/Makefile.am
index a785d62..fbb1a2e 100644
--- a/src/libosmo-mgcp/Makefile.am
+++ b/src/libosmo-mgcp/Makefile.am
@@ -42,7 +42,7 @@
 	mgcp_msg.c \
 	mgcp_conn.c \
 	mgcp_stat.c \
-	mgcp_ep.c \
+	mgcp_endp.c \
 	$(NULL)
 
 libosmo_mgcp_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(MGCP_LIBVERSION)