Updates specfile to match distro guidelines. Suppots modifying client directory path at build time.

- Support relocating client files at build time (required for LSB compliant nodes)
- OS varable added to perform some make choices
- Saving and exporting the Makefile vars now scripted using list of variables
- Updated specfile to match RH and SUSE requirements and guidelines
- Moved /usr/local/var to /var/local; dynamic files shall not use /usr.
- State files use %sharedstatedir for path (std for SLE and RHEL)
- Release value adjusted to meet different DEB and RPM reqs.

Signed-off-by: jcsiadal <jeremy.c.siadal@intel.com>

internal/pkg/buildconfig/setconfigs.go.in

@@ -4,6 +4,7 @@ func init() {
     bindir = "@BINDIR@"
     sysconfdir = "@SYSCONFDIR@"
     localstatedir = "@LOCALSTATEDIR@"
+    sharedstatedir = "@SHAREDSTATEDIR@"
     srvdir = "@SRVDIR@"
     tftpdir = "@TFTPDIR@"
     firewallddir = "@FIREWALLDDIR@"
@@ -11,6 +12,7 @@ func init() {
     wwoverlaydir = "@WWOVERLAYDIR@"
     wwchrootdir = "@WWCHROOTDIR@"
     wwprovisiondir = "@WWPROVISIONDIR@"
+    wwclientdir = "@WWCLIENTDIR@"
     version = "@VERSION@"
     release = "@RELEASE@"
     wwclientloc = "@WWCLIENTLOC"