ciao-cli: Add support for generic string matching in templates

[mcastelino]

ciao-cli: Add support for substring matching

Add support for new filter capabilities. This allows the selection
of list elements based on substring, prefix, suffix matching etc
which will be useful for test automation.

[coveralls]

Coverage increased (+0.02%) to 66.921% when pulling 5e5c6b9 on mcastelino:template-subset into 608387c on 01org:master.

[coveralls]

Coverage increased (+0.01%) to 66.917% when pulling 8f2d4e3 on mcastelino:template-subset into 608387c on 01org:master.

[markdryan]

This function is almost identical to filterByField. Perhaps we need to make a new function, fieldField that takes a function as a parameter, e.g.,

func filterField(obj interface{}, field, val string, cmp func(string,string) bool)(retval interface{}) {

filterBySubstr then becomes

func filterBySubstr(obj interface{}, field, val string) (retval interface{}) {
     return filterField(obj, field, val, strings.Contains)
}

filterByField

func filterByField(obj interface{}, field, val string) (retval interface{}) {
     return filterField(obj, field, val, func(a, b string) bool {
         return a == b
    })
}

You could then have a whole pile of filter functions, with no extra effort, e.g,

filter
filterSubstr (might be better to call is filterContains to match the std lib function called)
filterHasPrefix
filterHasSuffix
filterRegexp
filterFolded

[mcastelino]

@markdryan makes perfect sense. I will also add a few more generic filters based on what the strings suport today and with the same nomenclature. That may help in other areas also, specially event processing.

[mcastelino]

@markdryan updated as per review comments. Please re-review

[coveralls]

Coverage decreased (-0.009%) to 66.885% when pulling 604e734 on mcastelino:template-subset into e57e064 on 01org:master.

[markdryan]

Looks good to me.