fix(scripts/rpm): obtain the driver version (now different from the Falco version)

Co-authored-by: Lorenzo Fontana <lo@linux.com>
Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

scripts/rpm/postinstall.in

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2020 The Falco Authors.
 #
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -14,8 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-rpm_v=%{version}
-mod_version=${rpm_v//_/-}
+
+mod_version="@PROBE_VERSION@"
 dkms add -m falco -v $mod_version --rpm_safe_upgrade
 if [ `uname -r | grep -c "BOOT"` -eq 0 ] && [ -e /lib/modules/`uname -r`/build/include ]; then
 	dkms build -m falco -v $mod_version

scripts/rpm/preuninstall.in

@@ -19,6 +19,6 @@ if [ $1 = 0 ]; then
 	/sbin/service falco stop > /dev/null 2>&1
 	/sbin/chkconfig --del falco
 fi
-rpm_v=%{version}
-mod_version=${rpm_v//_/-}
+
+mod_version="@PROBE_VERSION@"
 dkms remove -m falco -v $mod_version --all --rpm_safe_upgrade