java: Raise JattachSocketMissing if the attach socket is missing (HS only for now)

[Jongy]

Based on #352

After removing /tmp/.java_pidX:

[2022-04-29 18:36:37,267] DEBUG: gprofiler.utils: (['/app/gprofiler/resources/java/jattach', '691779', 'load', '/tmp/gprofiler_tmp/async-profiler-v2.7g2/glibc/libasyncProfiler.so', 'true', 'start,event=cpu,file=/tmp/gprofiler_tmp/tmpk8bcej93/async-profiler-691779.output,collapsed,ann,sig,interval=10101010,log=/tmp/gprofiler_tmp/tmpk8bcej93/async-profiler-691779.log,fdtransfer,safemode=64,timeout=35']) stderr: 'Could not start attach mechanism: No such file or directory\n'
[2022-04-29 18:36:37,267] ERROR: gprofiler.profilers.profiler_base: JavaProfiler: failed to profile process 691779 (java)
Traceback (most recent call last):
  File "/app/gprofiler/profilers/profiler_base.py", line 139, in snapshot
    result = future.result()
  File "/usr/lib/python3.8/concurrent/futures/_base.py", line 437, in result
    return self.__get_result()
  File "/usr/lib/python3.8/concurrent/futures/_base.py", line 389, in __get_result
    raise self._exception
  File "/usr/lib/python3.8/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/app/gprofiler/profilers/java.py", line 854, in _profile_process
    return ProfileData(self._profile_process_stackcollapse(process), appid, app_metadata)
  File "/app/gprofiler/profilers/java.py", line 848, in _profile_process_stackcollapse
    return self._profile_ap_process(ap_proc, comm)
  File "/app/gprofiler/profilers/java.py", line 857, in _profile_ap_process
    started = ap_proc.start_async_profiler(self._interval, ap_timeout=self._ap_timeout)
  File "/app/gprofiler/profilers/java.py", line 479, in start_async_profiler
    self._run_async_profiler(start_cmd)
  File "/app/gprofiler/profilers/java.py", line 454, in _run_async_profiler
    raise JattachSocketMissing(*args) from None
gprofiler.profilers.java.JattachSocketMissing: Command '['/app/gprofiler/resources/java/jattach', '691779', 'load', '/tmp/gprofiler_tmp/async-profiler-v2.7g2/glibc/libasyncProfiler.so', 'true', 'start,event=cpu,file=/tmp/gprofiler_tmp/tmpk8bcej93/async-profiler-691779.output,collapsed,ann,sig,interval=10101010,log=/tmp/gprofiler_tmp/tmpk8bcej93/async-profiler-691779.log,fdtransfer,safemode=64,timeout=35']' returned non-zero exit status 1. 
stdout: b''
stderr: b'Could not start attach mechanism: No such file or directory\n'
Java PID: 691779
async-profiler DSO was loaded
async-profiler log:
(empty)
JVM attach socket is missing and jattach could not create it. It has most likely been removed; the process has to be restarted for a new socket to be created.

[Jongy]

Rebased, no diff

[Jongy]

$ git range-diff 9585329^..7a6fd66 master..jattach-socket-missing | cat
1:  9585329 = 1:  f237d66 java: Raise JattachSocketMissing if the attach socket is missing (HS only for now)
2:  fda5b0d = 2:  a7821fd Add comment
3:  7a6fd66 = 3:  b82a69c Rename exception and add a test