Fix OpenSUSE support

The dhcp-all-interfaces and simple-init elements did not have the ISC
DHCP Client package mapped for OpenSUSE, which caused DIB to fail with
"'isc-dhcp-client' not found in package names. Trying capabilities."

Similarly, the bootloader element did not have the grub-pc package
properly mapped for OpenSuse, which caused DIB to fail with "Package
'grub-pc' not found.".

This patch adds the package mappings for these elements so that the
opensuse element can be created and booted successfully.

Change-Id: Ife478158fec3a95de73a9206b38dcc6511d56cc8

elements/bootloader/pkg-map

@@ -6,7 +6,8 @@
       "grub-pc": "grub"
     },
     "suse": {
-      "dkms_package": ""
+      "dkms_package": "",
+      "grub-pc": "grub2"
     },
     "redhat": {
       "extlinux": "syslinux-extlinux",

elements/dhcp-all-interfaces/pkg-map

@@ -5,6 +5,9 @@
     },
     "gentoo": {
       "dhcp-client": "net-misc/dhcpcd"
+    },
+    "suse": {
+      "dhcp-client": "dhcp-client"
     }
   },
   "default": {

elements/simple-init/pkg-map

@@ -11,6 +11,9 @@
       "dhcp-client": "net-misc/dhcp",
       "python-pip": "dev-python/pip",
       "net-tools": "sys-apps/net-tools"
+    },
+    "suse": {
+      "dhcp-client": "dhcp-client"
     }
   },
   "default": {