[ACS4.4] cherry-pick

[Jayapal Reddy Uradi]

Hi Daan,

Please cherry-pick the following commits to 4.4.

commit 37a3a65c7c7f083a5536c078a1c8436ef9e14597
Author: Jayapal <jaya...@apache.org>
Date:   Mon May 26 15:10:35 2014 +0530
    CLOUDSTACK-6761: Fixed removing proxy arp rule on deleting static nat or PF 
rule on ip

commit 587ee544f2d8223599e5ee8c56f926ebf7882b8c
Author: Saurav Lahiri <saurav.lah...@sungard.com>
Date:   Tue Apr 15 12:08:11 2014 +0000
    CLOUDSTACK-6328: run.sh check if an existing java process is running, 
before spawining new ones
    Signed-off-by: Jayapal <jaya...@apache.org>

Thanks,
Jayapal