repo.conf: Update poky, meta-exceet and meta-qt5 to latest revision

conf/repo.conf

 [modules]
-poky = http://git.yoctoproject.org/git/poky;rev=0d6e6eb5101c1f24dabd4232d8a08369512c69e3;branch=rocko
-meta-qt5 = https://github.com/meta-qt5/meta-qt5;rev=d3420f1e481a2230f1c6c325fadd04490174b301;branch=rocko
-meta-exceet = {GIT_SERVER}:yocto-exceet/meta-exceet;rev=34e172069cc442d870a103728cb706fb11fa5388;branch=rocko
+poky = http://git.yoctoproject.org/git/poky;rev=68a612b7d31d270348ef5439d7f779c309bdb6ec;branch=rocko
+meta-qt5 = https://github.com/meta-qt5/meta-qt5;rev=d8b531530fa42b59aa0a5b123d87a30d749cbcc4;branch=rocko
+meta-exceet = {GIT_SERVER}:yocto-exceet/meta-exceet;rev=60686347e124591a5528983578e8bd6069d7f9e0;branch=rocko
 meta-freescale = https://git.yoctoproject.org/git/meta-freescale;rev=61ab34ac6d664a229847b796ec20fd9f7c8ecbf4;branch=rocko
 meta-openembedded = http://git.openembedded.org/meta-openembedded;rev=eae996301d9c097bcbeb8046f08041dc82bb62f8;branch=rocko