[infer][java] call inferlib programmatically instead of calling inferJ from the command line

Summary:
@public
This should simplify the process of passing around command line arguments

Test Plan: Infer CI. No functional change intended

infer/bin/jwlib.py

@@ -16,7 +16,7 @@ current_directory = os.getcwd()
 parser.add_argument('-version', action='store_true')
 parser.add_argument('-cp', '-classpath', type=str, dest='classpath')
 parser.add_argument('-bootclasspath', type=str)
-parser.add_argument('-d', dest='classes_out')
+parser.add_argument('-d', dest='classes_out', default=current_directory)
 
 
 class CompilerCall:

infer/lib/capture/javac.py

@@ -3,7 +3,8 @@ import subprocess
 import traceback
 import util
 
-import utils  # this is module located in ../utils.py
+import inferlib
+
 MODULE_NAME = __name__
 MODULE_DESCRIPTION = '''Run analysis of code built with a command like:
 javac <options> <source files>
@@ -22,23 +23,11 @@ create_argparser = util.base_argparser(MODULE_DESCRIPTION, MODULE_NAME)
 
 class JavacCapture:
     def __init__(self, args, cmd):
-        self.args = args
+        self.analysis = inferlib.Infer(args, cmd[1:])
-        self.cmd = cmd
 
     def capture(self):
-        # run inferJ only in capture mode
-        # pass all the frontend args (if any)
-        capture_cmd = [utils.get_cmd_in_bin_dir('inferJ')]
-        capture_cmd += ['--out', self.args.infer_out]
-        capture_cmd += ['--analyzer', self.args.analyzer]
-        if self.args.no_filtering:
-            capture_cmd.append('--no-filtering')
-        if self.args.debug:
-            capture_cmd.append('-g')
-        capture_cmd += self.cmd
-
         try:
-            subprocess.check_call(capture_cmd)
+            self.analysis.start()
             return os.EX_OK
         except subprocess.CalledProcessError as exc:
             if self.args.debug: