task-self-hosted: add hicolor-icon-theme and socat

python-pygtk depends on libgtk and libgtk's recommends have
gdk-pixbuf-loader-{png,jpeg,gif,xpm}, so we have the warnings.
We can add hicolor-icon-theme to fix the warning:
Configuring gdk-pixbuf-loader-png.
gtk-update-icon-cache: No theme index file.
Configuring gdk-pixbuf-loader-jpeg.
gtk-update-icon-cache: No theme index file.
Configuring liberation-fonts.
Configuring gdk-pixbuf-loader-xpm.
gtk-update-icon-cache: No theme index file.
Configuring gdk-pixbuf-loader-gif.
gtk-update-icon-cache: No theme index file.

Add socat for to faciliate proxy setting.

(From OE-Core rev: d32933a74b380aac906bbfbe1ec7d89b02e9f72d)

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/tasks/task-self-hosted.bb

@@ -3,7 +3,7 @@
 #
 
 DESCRIPTION = "Create Basic Image Tasks"
-PR = "r5"
+PR = "r6"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58 \
                     file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
@@ -109,6 +109,7 @@ RDEPENDS_task-self-hosted-extended = "\
     grep \
     groff \
     gzip \
+    hicolor-icon-theme \
     libaio \
     libusb1 \
     libxml2 \
@@ -161,6 +162,7 @@ RDEPENDS_task-self-hosted-extended = "\
     readline \
     rpm \
     setserial \
+    socat \
     subversion \
     sudo \
     sysstat \