client.shared: Move all memory related functions to utils_memory.py

Move all memory related functions from client/base_utils.py to
client/shared/utils_memory.py. Also update the scripts call the
memory related functions.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
client.base_sysinfo: Record /proc/buddyinfo before and after iteration

/proc/buddyinfo can help to analyse the fragement status in host. This
will help to analyse the failed reason for some memory related test.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
client.shared.utils_memory: Add four functions related with host memory status check

read_from_vmstat: Use for reading host memory status such as nr_mlock
read_from_smaps: Use for reading process status like AnonHugePages
get_buddy_info: Get the fragement status in host. Will helpful for
                the huge page related function to decide if there
                is enough space for the test.
read_from_numa_maps: Use for reading process numa status like the pages
                     use in each node and informations like this.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
setup.py: Fix document generation

Our setup file was refering to a non existing method, that was removed
in one of our refactorings. Let's get rid of it.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>