This patch adds cgcreate tool

This patch adds cgcreate tool

This patch adds cgcreate tool, which creates cgroups based on input
    parameters - the syntax is:

    cgcreate -t <tuid>:<tgid> -a <agid>:<auid> -g <list of
controllers>:<relative path to cgroup>

    where:
    -a enables user to define admin gid and uid (implicit values are the
same values which are in the parent directory)
    -t enables user to define task gid and uid (implicit values are the
same values which are in parent directory)
    -g sets pairs list of controllers-relative path to cgroup

-------------------------------------------------
EXAMPLES:
* ../../libtool --mode=execute ./cgcreate -a :varekova  -g cpuacct:first

* ll /mnt/cgroups/cpuacct | grep first
drwxrwxr-x 2 root     varekova 0 2009-06-03 09:14 first

* ll /mnt/cgroups/cpuacct/first/*
-rwxrwxr-x 1 root varekova 0 2009-06-03 09:14 /mnt/cgroups/cpuacct/first/cpuacct.usage
-rwxrwxr-x 1 root varekova 0 2009-06-03 09:14 /mnt/cgroups/cpuacct/first/notify_on_release
-rwxrwxr-x 1 root varekova 0 2009-06-03 09:14 /mnt/cgroups/cpuacct/first/tasks

* ../../libtool --mode=execute ./cgcreate -a varekova:root -t varekova:varekova -g cpuacct:second

* ll /mnt/cgroups/cpuacct/ | grep second
drwxrwxr-x 2 varekova root     0 2009-06-03 09:13 second

* ll /mnt/cgroups/cpuacct/second
total 0
-rwxrwxr-x 1 varekova root     0 2009-06-03 09:13 cpuacct.usage
-rwxrwxr-x 1 varekova root     0 2009-06-03 09:13 notify_on_release
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:13 tasks

* ../../libtool --mode=execute ./cgcreate -a varekova:varekova  -g cpuacct:third -g cpuacct:fourth

* ll /mnt/cgroups/cpuacct | grep h
drwxrwxr-x 2 varekova varekova 0 2009-06-03 09:18 fourth
drwxrwxr-x 2 varekova varekova 0 2009-06-03 09:18 third

* ll /mnt/cgroups/cpuacct/*h*
/mnt/cgroups/cpuacct/fourth:
total 0
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:18 cpuacct.usage
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:18 notify_on_release
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:18 tasks

/mnt/cgroups/cpuacct/third:
total 0
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:18 cpuacct.usage
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:18 notify_on_release
-rwxrwxr-x 1 varekova varekova 0 2009-06-03 09:18 tasks

Signed-off-by: Ivana Varekova <varekova@redhat.com>