Regenerate keystore (+1000 days from now) (rebased onto dev_5_0)


This is the same as gh-3251 but rebased onto dev_5_0.

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@mtbc pointed out the current self-signed certificate is about to expire. To test... check webstart works with the new self-signed certificate and that the new expiry date is sensible.

```
$ keytool -list -v -keystore lib/keystore
Enter keystore password:

*****************  WARNING WARNING WARNING  *****************
* The integrity of the information stored in your keystore  *
* has NOT been verified!  In order to verify its integrity, *
* you must provide your keystore password.                  *
*****************  WARNING WARNING WARNING  *****************

Keystore type: JKS
Keystore provider: SUN

Your keystore contains 1 entry

Alias name: omedev
Creation date: 04-Dec-2014
Entry type: PrivateKeyEntry
Certificate chain length: 1
Certificate[1]:
Owner: CN=omedev, OU=Open Microscopy Team, O=openmicroscopy.org, C=UK
Issuer: CN=omedev, OU=Open Microscopy Team, O=openmicroscopy.org, C=UK
Serial number: 4439f1dc
Valid from: Thu Dec 04 17:17:02 GMT 2014 until: Wed Aug 30 18:17:02 BST 2017
Certificate fingerprints:
         MD5:  45:AF:4A:93:C9:32:B0:CF:80:87:01:C0:4F:CC:E2:9E
         SHA1: 9D:D0:56:80:6F:02:7E:A6:23:FF:7A:9E:A6:51:9E:71:D9:C1:80:88
         SHA256: B2:69:12:B3:78:13:08:BC:3B:90:2A:A7:58:08:7B:E5:39:06:96:BC:62:6C:CD:B9:51:C3:60:56:27:24:2D:82
         Signature algorithm name: SHA1withDSA
         Version: 3

Extensions:

#1: ObjectId: 2.5.29.14 Criticality=false
SubjectKeyIdentifier [
KeyIdentifier [
0000: 89 C8 96 10 EC 88 C1 0A   78 D0 40 83 E6 18 18 63  ........x.@....c
0010: A6 D2 FF E0                                        ....
]
]



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```