Advanced filters

[allmightyspiff]

Adds --json-filter to call-api, allowing more complex filters.

./slcli -v call-api SoftLayer_Account getVirtualGuests --limit=10 --json-filter '{"virtualGuests":{"hostname": {"operation": "^= test"}}}'

Adds json parsing for parameters. If a json-looking string is passed in as a parameter, call api will try to format it properly, instead of sending a string in.

$ ./slcli -vvv call-api SoftLayer_Virtual_Guest editObject --id=98316716 '{"hostname":"test-a271e"}'

Calling: SoftLayer_Virtual_Guest::editObject(id=98316716, mask='', filter='{}', args=({'hostname': 'test-a271e'},), limit=None, offset=None))

curl -u $SL_USER:$SL_APIKEY -X POST -H "Accept: */*" -H "Accept-Encoding: gzip, deflate, compress" -d '{"parameters": [{"hostname": "test-a271e"}]}' 'https://api.softlayer.com/rest/v3.1/SoftLayer_Virtual_Guest/98316716/editObject.json'

Fixes #801

[coveralls]

Coverage increased (+0.02%) to 93.848% when pulling 66d85aa on allmightyspiff:advancedFilters into 0e06b79 on softlayer:master.

[ATGE]

old/new filter ways are working as expected, so looks good.

[FernandoOjeda]

It is working well. Looks good too.

[caberos]

is working well, but in windows the empty space in the JSON throwing an error in format, the documentation should recommend not input empty spaces.

example:
{""virtualGuests"": {""hostname"":{""operation"\ : ""techProvide""}}}