Replace kprobe function "blk_account_io_completion" to "blk_account_io_done" for kernel version >= 5.8.0

The kernel function "blk_account_io_completion" is not available anymore as attach point of Kprobe as of kernel version 5.8.0. Therefore, after discussions, we decided to use function "blk_account_io_done" instead in every kprobe attachment to "blk_account_io_completion".

When using python3, 'print' will output the bytes arrays with the "b"
prefix. Switch to printb to get rid of the prefix.

Signed-off-by: Gary Lin <glin@suse.com>

- chmod +x dddos.py mallocstacks.py stack_buildid_example.py
- Handle Ctrl-C keyboard interrupt for dddos.py, disksnoop.py,
  hello_perf_output.py, stacksnoop.py and trace_perf_output.py

* fixed shebangs in tools (and lib)

* fixed shebangs in examples

* do not mangle shebangs in rpm spec

* renamed style-check.sh to c-style-check.sh

* factored out python linter to a separate file

* added shebang validation to the py-style-check

* added shebangs to all python executables

Examples directory has been growing, so add a bit of organization.

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

The previous patch #195 for autoloading of kprobes only did it for
trace_print. Turn this feature on for all trace_* functions. This
requires that these functions are also no longer staticmethods.

Enable the feature in examples/disksnoop.py

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Per suggestion in #149

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Per suggestion in #149

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Rename python module to bcc
* Rename python-bpf (deb,rpm) package to python-bcc
* Pending this change, I will likely re-tag 0.1.6, and upload the bcc
  package to pypi.python.org

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Per feedback on the attach_kprobe api, change up the arguments to remove
the load_func that typically preceeds the call. Instead, move this
inside the attach_kprobe implementation. Also, this makes attach_kprobe
need to be non-static. The same applies to attach_kretprobe.

Old:
fn = b.load_func("hello", BPF.KPROBE)
BPF.attach_kprobe(fn, "sys_clone")

New:
b.attach_kprobe(event="sys_clone", fn_name="hello")

Note that the kwarg style is not required, but I fixed up the current
usages to provide readability.

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>