Remove subunit from Centos requirements.

JIRA: VPP-1229

Subunit and Subunit-devel in Fedora and Epel but not Centos.
This patch moves the Fedora from the Centos specific requirements.

Change-Id: I093a4571cddf14af5ee2827ba8ee00c7bcbe6fc0
Signed-off-by: Thomas F Herbert <therbert@redhat.com>
diff --git a/Makefile b/Makefile
index 1f24c17..5cc5849 100644
--- a/Makefile
+++ b/Makefile
@@ -84,16 +84,17 @@
 RPM_DEPENDS += numactl-devel
 RPM_DEPENDS += check check-devel
 RPM_DEPENDS += boost boost-devel
-RPM_DEPENDS += subunit subunit-devel
 RPM_DEPENDS += selinux-policy selinux-policy-devel
 
 ifeq ($(OS_ID)-$(OS_VERSION_ID),fedora-25)
+	RPM_DEPENDS += subunit subunit-devel
 	RPM_DEPENDS += openssl-devel
 	RPM_DEPENDS += python-devel python2-ply
 	RPM_DEPENDS += python2-virtualenv
 	RPM_DEPENDS += mbedtls-devel
 	RPM_DEPENDS_GROUPS = 'C Development Tools and Libraries'
 else ifeq ($(shell if [ "$(OS_ID)" = "fedora" ]; then test $(OS_VERSION_ID) -gt 25; echo $$?; fi),0)
+	RPM_DEPENDS += subunit subunit-devel
 	RPM_DEPENDS += compat-openssl10-devel
 	RPM_DEPENDS += python2-devel python2-ply
 	RPM_DEPENDS += python2-virtualenv