meson: update dependency

Add subprojects file and update .gitignore

Also, remove the test/Makefile.am file.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I39be4b64d53d2aef1884ce0b7475c2cfc39c7ac4
diff --git a/meson.build b/meson.build
index ee9a1a4..7d94efb 100644
--- a/meson.build
+++ b/meson.build
@@ -27,10 +27,14 @@
 
 # Find the dependencies
 
-sdbusplus       =   dependency ('sdbusplus')
-logging         =   dependency ('phosphor-logging')
-dbus            =   dependency ('phosphor-dbus-interfaces')
-deps            =   [sdbusplus, logging, dbus]
+sdbusplus_dep = dependency ('sdbusplus')
+phosphor_logging_dep = dependency ('phosphor-logging')
+phosphor_dbus_interfaces_dep = dependency ('phosphor-dbus-interfaces')
+deps = [
+    sdbusplus_dep,
+    phosphor_logging_dep,
+    phosphor_dbus_interfaces_dep,
+]
 
 ###########################################################################