transition to cli11 instead of custom arg parser

Transition to use cli11 for argument parsing instead of a custom
argument parser.

Tested: Not tested on hardware.
Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I9c516c8c2d76e35c6c31592f96e8f281e9d47ad6
diff --git a/configure.ac b/configure.ac
index 7ee9a75..19da3d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,12 @@
 PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus])
 PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging])
 PKG_CHECK_MODULES([LIBIPMID], [libipmid])
+# We need the header only CLI library
+AC_CHECK_HEADERS(
+    [CLI/CLI.hpp],
+    [],
+    [AC_MSG_ERROR([Could not find CLI11 CLI/CLI.hpp])]
+)
 
 # Checks for header files.
 AC_CHECK_HEADER(systemd/sd-bus.h, ,[AC_MSG_ERROR([Could not find systemd/sd-bus.h...systemd development package required])])