[infer][java] stop swallowing errors coming from compilation failures

Summary:
No longer swallow compilation failures for javac. Before this diff, the compilation failures where raised:

  > infer -- javac Test.java
  Test.java:5: error: ';' expected
    static String str = "Hello"
                               ^
  1 error

but the exit code was incorrect:

  > echo $?
  0

With this diff, the failing command is printed in standard error:

  > infer -- javac Test.java
  Javac compilation error with:

  ['javac', '-g', 'Test.java', '-J-Duser.language=en']

and the exit code is different from 0.

  > echo $?
  1

infer/bin/inferlib.py

@@ -69,8 +69,6 @@ class VersionAction(argparse._VersionAction):
                                             option_string)
 
 
-
-
 base_parser = argparse.ArgumentParser(add_help=False)
 base_group = base_parser.add_argument_group('global arguments')
 base_group.add_argument('-o', '--out', metavar='<directory>',

infer/bin/jwlib.py

@@ -7,10 +7,10 @@
 # of patent rights can be found in the PATENTS file in the same directory.
 
 import argparse
-import logging
-import tempfile
 import os
+import tempfile
 import subprocess
+import utils
 
 # javac options
 parser = argparse.ArgumentParser()
@@ -44,14 +44,13 @@ class CompilerCall:
                     prefix='javac_',
                     delete=False) as file_out:
                 self.verbose_out = file_out.name
-
                 try:
                     subprocess.check_call(javac_cmd, stderr=file_out)
-                    return os.EX_OK
+                except subprocess.CalledProcessError:
-                except subprocess.CalledProcessError as exc:
                     error_msg = 'Javac compilation error with: \n\n{}\n'
                     failing_cmd = [arg for arg in javac_cmd
                                    if arg != '-verbose']
-                    logging.error(error_msg.format(failing_cmd))
+                    utils.error(error_msg.format(failing_cmd))
-                    os.system(' '.join(failing_cmd))
+                    subprocess.check_call(failing_cmd)
-                    return exc.returncode
+
+        return os.EX_OK